From f3d500085c0fec96a8ae59bc164e06a55a0beacb Mon Sep 17 00:00:00 2001
From: hroff-1902 <hroff_raeyd9tzpttf@mail.ru>
Date: Sun, 2 Feb 2020 07:00:40 +0300
Subject: [PATCH] Add some type hints

---
 freqtrade/commands/data_commands.py           | 10 +++--
 freqtrade/commands/deploy_commands.py         |  4 +-
 freqtrade/commands/plot_commands.py           |  2 +-
 freqtrade/configuration/check_exchange.py     |  2 +-
 .../configuration/deprecated_settings.py      |  4 +-
 .../configuration/directory_operations.py     |  2 +-
 freqtrade/configuration/timerange.py          |  5 ++-
 freqtrade/data/btanalysis.py                  |  7 +--
 freqtrade/data/history.py                     | 12 ++---
 freqtrade/edge/edge_positioning.py            |  4 +-
 freqtrade/exchange/exchange.py                | 45 +++++++++++--------
 freqtrade/freqtradebot.py                     | 16 +++----
 freqtrade/misc.py                             |  9 ++--
 freqtrade/optimize/backtesting.py             | 10 +++--
 freqtrade/optimize/hyperopt.py                | 18 ++++----
 freqtrade/pairlist/IPairList.py               |  5 ++-
 freqtrade/pairlist/PrecisionFilter.py         |  6 +--
 freqtrade/pairlist/PriceFilter.py             |  5 ++-
 freqtrade/pairlist/VolumePairList.py          |  7 +--
 freqtrade/persistence.py                      |  9 ++--
 freqtrade/plot/plotting.py                    |  2 +-
 freqtrade/resolvers/iresolver.py              |  2 +-
 freqtrade/resolvers/strategy_resolver.py      |  7 +--
 freqtrade/rpc/rpc.py                          |  5 ++-
 freqtrade/rpc/rpc_manager.py                  |  2 +-
 freqtrade/strategy/interface.py               |  2 +-
 freqtrade/wallets.py                          | 10 ++---
 freqtrade/worker.py                           |  2 +-
 28 files changed, 114 insertions(+), 100 deletions(-)

diff --git a/freqtrade/commands/data_commands.py b/freqtrade/commands/data_commands.py
index c01772023..aeb598009 100644
--- a/freqtrade/commands/data_commands.py
+++ b/freqtrade/commands/data_commands.py
@@ -1,6 +1,6 @@
 import logging
 import sys
-from typing import Any, Dict, List
+from typing import Any, Dict, List, cast
 
 import arrow
 
@@ -43,16 +43,18 @@ def start_download_data(args: Dict[str, Any]) -> None:
         if config.get('download_trades'):
             pairs_not_available = refresh_backtest_trades_data(
                 exchange, pairs=config["pairs"], datadir=config['datadir'],
-                timerange=timerange, erase=config.get("erase"))
+                timerange=timerange, erase=cast(bool, config.get("erase")))
 
             # Convert downloaded trade data to different timeframes
             convert_trades_to_ohlcv(
                 pairs=config["pairs"], timeframes=config["timeframes"],
-                datadir=config['datadir'], timerange=timerange, erase=config.get("erase"))
+                datadir=config['datadir'], timerange=timerange,
+                erase=cast(bool, config.get("erase")))
         else:
             pairs_not_available = refresh_backtest_ohlcv_data(
                 exchange, pairs=config["pairs"], timeframes=config["timeframes"],
-                datadir=config['datadir'], timerange=timerange, erase=config.get("erase"))
+                datadir=config['datadir'], timerange=timerange,
+                erase=cast(bool, config.get("erase")))
 
     except KeyboardInterrupt:
         sys.exit("SIGINT received, aborting ...")
diff --git a/freqtrade/commands/deploy_commands.py b/freqtrade/commands/deploy_commands.py
index 99ae63244..809740661 100644
--- a/freqtrade/commands/deploy_commands.py
+++ b/freqtrade/commands/deploy_commands.py
@@ -28,7 +28,7 @@ def start_create_userdir(args: Dict[str, Any]) -> None:
         sys.exit(1)
 
 
-def deploy_new_strategy(strategy_name, strategy_path: Path, subtemplate: str):
+def deploy_new_strategy(strategy_name: str, strategy_path: Path, subtemplate: str) -> None:
     """
     Deploy new strategy from template to strategy_path
     """
@@ -69,7 +69,7 @@ def start_new_strategy(args: Dict[str, Any]) -> None:
         raise OperationalException("`new-strategy` requires --strategy to be set.")
 
 
-def deploy_new_hyperopt(hyperopt_name, hyperopt_path: Path, subtemplate: str):
+def deploy_new_hyperopt(hyperopt_name: str, hyperopt_path: Path, subtemplate: str) -> None:
     """
     Deploys a new hyperopt template to hyperopt_path
     """
diff --git a/freqtrade/commands/plot_commands.py b/freqtrade/commands/plot_commands.py
index 028933ba7..5e547acb0 100644
--- a/freqtrade/commands/plot_commands.py
+++ b/freqtrade/commands/plot_commands.py
@@ -5,7 +5,7 @@ from freqtrade.exceptions import OperationalException
 from freqtrade.state import RunMode
 
 
-def validate_plot_args(args: Dict[str, Any]):
+def validate_plot_args(args: Dict[str, Any]) -> None:
     if not args.get('datadir') and not args.get('config'):
         raise OperationalException(
             "You need to specify either `--datadir` or `--config` "
diff --git a/freqtrade/configuration/check_exchange.py b/freqtrade/configuration/check_exchange.py
index 0076b1c5d..92daaf251 100644
--- a/freqtrade/configuration/check_exchange.py
+++ b/freqtrade/configuration/check_exchange.py
@@ -10,7 +10,7 @@ from freqtrade.state import RunMode
 logger = logging.getLogger(__name__)
 
 
-def remove_credentials(config: Dict[str, Any]):
+def remove_credentials(config: Dict[str, Any]) -> None:
     """
     Removes exchange keys from the configuration and specifies dry-run
     Used for backtesting / hyperopt / edge and utils.
diff --git a/freqtrade/configuration/deprecated_settings.py b/freqtrade/configuration/deprecated_settings.py
index 78d8218d4..55497d4f5 100644
--- a/freqtrade/configuration/deprecated_settings.py
+++ b/freqtrade/configuration/deprecated_settings.py
@@ -13,7 +13,7 @@ logger = logging.getLogger(__name__)
 
 def check_conflicting_settings(config: Dict[str, Any],
                                section1: str, name1: str,
-                               section2: str, name2: str):
+                               section2: str, name2: str) -> None:
     section1_config = config.get(section1, {})
     section2_config = config.get(section2, {})
     if name1 in section1_config and name2 in section2_config:
@@ -28,7 +28,7 @@ def check_conflicting_settings(config: Dict[str, Any],
 
 def process_deprecated_setting(config: Dict[str, Any],
                                section1: str, name1: str,
-                               section2: str, name2: str):
+                               section2: str, name2: str) -> None:
     section2_config = config.get(section2, {})
 
     if name2 in section2_config:
diff --git a/freqtrade/configuration/directory_operations.py b/freqtrade/configuration/directory_operations.py
index 43a209483..5f8eb76b0 100644
--- a/freqtrade/configuration/directory_operations.py
+++ b/freqtrade/configuration/directory_operations.py
@@ -23,7 +23,7 @@ def create_datadir(config: Dict[str, Any], datadir: Optional[str] = None) -> Pat
     return folder
 
 
-def create_userdata_dir(directory: str, create_dir=False) -> Path:
+def create_userdata_dir(directory: str, create_dir: bool = False) -> Path:
     """
     Create userdata directory structure.
     if create_dir is True, then the parent-directory will be created if it does not exist.
diff --git a/freqtrade/configuration/timerange.py b/freqtrade/configuration/timerange.py
index a8be873df..3db5f6217 100644
--- a/freqtrade/configuration/timerange.py
+++ b/freqtrade/configuration/timerange.py
@@ -7,6 +7,7 @@ from typing import Optional
 
 import arrow
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -30,7 +31,7 @@ class TimeRange:
         return (self.starttype == other.starttype and self.stoptype == other.stoptype
                 and self.startts == other.startts and self.stopts == other.stopts)
 
-    def subtract_start(self, seconds) -> None:
+    def subtract_start(self, seconds: int) -> None:
         """
         Subtracts <seconds> from startts if startts is set.
         :param seconds: Seconds to subtract from starttime
@@ -59,7 +60,7 @@ class TimeRange:
             self.starttype = 'date'
 
     @staticmethod
-    def parse_timerange(text: Optional[str]):
+    def parse_timerange(text: Optional[str]) -> 'TimeRange':
         """
         Parse the value of the argument --timerange to determine what is the range desired
         :param text: value from --timerange
diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index 04b2ca980..c28e462ba 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -3,7 +3,7 @@ Helpers when analyzing backtest data
 """
 import logging
 from pathlib import Path
-from typing import Dict
+from typing import Dict, Union
 
 import numpy as np
 import pandas as pd
@@ -20,7 +20,7 @@ BT_DATA_COLUMNS = ["pair", "profitperc", "open_time", "close_time", "index", "du
                    "open_rate", "close_rate", "open_at_end", "sell_reason"]
 
 
-def load_backtest_data(filename) -> pd.DataFrame:
+def load_backtest_data(filename: Union[Path, str]) -> pd.DataFrame:
     """
     Load backtest data file.
     :param filename: pathlib.Path object, or string pointing to the file.
@@ -151,7 +151,8 @@ def extract_trades_of_period(dataframe: pd.DataFrame, trades: pd.DataFrame) -> p
     return trades
 
 
-def combine_tickers_with_mean(tickers: Dict[str, pd.DataFrame], column: str = "close"):
+def combine_tickers_with_mean(tickers: Dict[str, pd.DataFrame],
+                              column: str = "close") -> pd.DataFrame:
     """
     Combine multiple dataframes "column"
     :param tickers: Dict of Dataframes, dict key should be pair.
diff --git a/freqtrade/data/history.py b/freqtrade/data/history.py
index 30d168f78..d891aa5b0 100644
--- a/freqtrade/data/history.py
+++ b/freqtrade/data/history.py
@@ -86,7 +86,7 @@ def load_tickerdata_file(datadir: Path, pair: str, timeframe: str,
 
 
 def store_tickerdata_file(datadir: Path, pair: str,
-                          timeframe: str, data: list, is_zip: bool = False):
+                          timeframe: str, data: list, is_zip: bool = False) -> None:
     """
     Stores tickerdata to file
     """
@@ -109,7 +109,7 @@ def load_trades_file(datadir: Path, pair: str,
 
 
 def store_trades_file(datadir: Path, pair: str,
-                      data: list, is_zip: bool = True):
+                      data: list, is_zip: bool = True) -> None:
     """
     Stores tickerdata to file
     """
@@ -117,7 +117,7 @@ def store_trades_file(datadir: Path, pair: str,
     misc.file_dump_json(filename, data, is_zip=is_zip)
 
 
-def _validate_pairdata(pair, pairdata, timerange: TimeRange):
+def _validate_pairdata(pair: str, pairdata: List[Dict], timerange: TimeRange) -> None:
     if timerange.starttype == 'date' and pairdata[0][0] > timerange.startts * 1000:
         logger.warning('Missing data at start for pair %s, data starts at %s',
                        pair, arrow.get(pairdata[0][0] // 1000).strftime('%Y-%m-%d %H:%M:%S'))
@@ -331,7 +331,7 @@ def _download_pair_history(datadir: Path,
 
 def refresh_backtest_ohlcv_data(exchange: Exchange, pairs: List[str], timeframes: List[str],
                                 datadir: Path, timerange: Optional[TimeRange] = None,
-                                erase=False) -> List[str]:
+                                erase: bool = False) -> List[str]:
     """
     Refresh stored ohlcv data for backtesting and hyperopt operations.
     Used by freqtrade download-data subcommand.
@@ -401,7 +401,7 @@ def _download_trades_history(datadir: Path,
 
 
 def refresh_backtest_trades_data(exchange: Exchange, pairs: List[str], datadir: Path,
-                                 timerange: TimeRange, erase=False) -> List[str]:
+                                 timerange: TimeRange, erase: bool = False) -> List[str]:
     """
     Refresh stored trades data for backtesting and hyperopt operations.
     Used by freqtrade download-data subcommand.
@@ -428,7 +428,7 @@ def refresh_backtest_trades_data(exchange: Exchange, pairs: List[str], datadir:
 
 
 def convert_trades_to_ohlcv(pairs: List[str], timeframes: List[str],
-                            datadir: Path, timerange: TimeRange, erase=False) -> None:
+                            datadir: Path, timerange: TimeRange, erase: bool = False) -> None:
     """
     Convert stored trades data to ohlcv data
     """
diff --git a/freqtrade/edge/edge_positioning.py b/freqtrade/edge/edge_positioning.py
index 15883357b..1506b4ed5 100644
--- a/freqtrade/edge/edge_positioning.py
+++ b/freqtrade/edge/edge_positioning.py
@@ -1,7 +1,7 @@
 # pragma pylint: disable=W0603
 """ Edge positioning package """
 import logging
-from typing import Any, Dict, NamedTuple
+from typing import Any, Dict, List, NamedTuple
 
 import arrow
 import numpy as np
@@ -181,7 +181,7 @@ class Edge:
                            'strategy stoploss is returned instead.')
             return self.strategy.stoploss
 
-    def adjust(self, pairs) -> list:
+    def adjust(self, pairs: List[str]) -> list:
         """
         Filters out and sorts "pairs" according to Edge calculated pairs
         """
diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 87c189457..f7bfb0ee1 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -24,6 +24,12 @@ from freqtrade.exceptions import (DependencyException, InvalidOrderException,
 from freqtrade.exchange.common import BAD_EXCHANGES, retrier, retrier_async
 from freqtrade.misc import deep_merge_dicts
 
+
+# Should probably use typing.Literal when we switch to python 3.8+
+# CcxtModuleType = Literal[ccxt, ccxt_async]
+CcxtModuleType = Any
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -51,7 +57,7 @@ class Exchange:
     }
     _ft_has: Dict = {}
 
-    def __init__(self, config: dict, validate: bool = True) -> None:
+    def __init__(self, config: Dict[str, Any], validate: bool = True) -> None:
         """
         Initializes this module with the given config,
         it does basic validation whether the specified exchange and pairs are valid.
@@ -135,7 +141,7 @@ class Exchange:
         if self._api_async and inspect.iscoroutinefunction(self._api_async.close):
             asyncio.get_event_loop().run_until_complete(self._api_async.close())
 
-    def _init_ccxt(self, exchange_config: dict, ccxt_module=ccxt,
+    def _init_ccxt(self, exchange_config: Dict[str, Any], ccxt_module: CcxtModuleType = ccxt,
                    ccxt_kwargs: dict = None) -> ccxt.Exchange:
         """
         Initialize ccxt with given config and return valid
@@ -224,13 +230,13 @@ class Exchange:
         markets = self.markets
         return sorted(set([x['quote'] for _, x in markets.items()]))
 
-    def klines(self, pair_interval: Tuple[str, str], copy=True) -> DataFrame:
+    def klines(self, pair_interval: Tuple[str, str], copy: bool = True) -> DataFrame:
         if pair_interval in self._klines:
             return self._klines[pair_interval].copy() if copy else self._klines[pair_interval]
         else:
             return DataFrame()
 
-    def set_sandbox(self, api, exchange_config: dict, name: str):
+    def set_sandbox(self, api: ccxt.Exchange, exchange_config: dict, name: str) -> None:
         if exchange_config.get('sandbox'):
             if api.urls.get('test'):
                 api.urls['api'] = api.urls['test']
@@ -240,7 +246,7 @@ class Exchange:
                                      "Please check your config.json")
                 raise OperationalException(f'Exchange {name} does not provide a sandbox api')
 
-    def _load_async_markets(self, reload=False) -> None:
+    def _load_async_markets(self, reload: bool = False) -> None:
         try:
             if self._api_async:
                 asyncio.get_event_loop().run_until_complete(
@@ -273,7 +279,7 @@ class Exchange:
         except ccxt.BaseError:
             logger.exception("Could not reload markets.")
 
-    def validate_stakecurrency(self, stake_currency) -> None:
+    def validate_stakecurrency(self, stake_currency: str) -> None:
         """
         Checks stake-currency against available currencies on the exchange.
         :param stake_currency: Stake-currency to validate
@@ -319,7 +325,7 @@ class Exchange:
                                f"Please check if you are impacted by this restriction "
                                f"on the exchange and eventually remove {pair} from your whitelist.")
 
-    def get_valid_pair_combination(self, curr_1, curr_2) -> str:
+    def get_valid_pair_combination(self, curr_1: str, curr_2: str) -> str:
         """
         Get valid pair combination of curr_1 and curr_2 by trying both combinations.
         """
@@ -373,7 +379,7 @@ class Exchange:
             raise OperationalException(
                 f'Time in force policies are not supported for {self.name} yet.')
 
-    def validate_required_startup_candles(self, startup_candles) -> None:
+    def validate_required_startup_candles(self, startup_candles: int) -> None:
         """
         Checks if required startup_candles is more than ohlcv_candle_limit.
         Requires a grace-period of 5 candles - so a startup-period up to 494 is allowed by default.
@@ -392,7 +398,7 @@ class Exchange:
         """
         return endpoint in self._api.has and self._api.has[endpoint]
 
-    def amount_to_precision(self, pair, amount: float) -> float:
+    def amount_to_precision(self, pair: str, amount: float) -> float:
         '''
         Returns the amount to buy or sell to a precision the Exchange accepts
         Reimplementation of ccxt internal methods - ensuring we can test the result is correct
@@ -406,7 +412,7 @@ class Exchange:
 
         return amount
 
-    def price_to_precision(self, pair, price: float) -> float:
+    def price_to_precision(self, pair: str, price: float) -> float:
         '''
         Returns the price rounded up to the precision the Exchange accepts.
         Partial Reimplementation of ccxt internal method decimal_to_precision(),
@@ -494,7 +500,7 @@ class Exchange:
             raise OperationalException(e) from e
 
     def buy(self, pair: str, ordertype: str, amount: float,
-            rate: float, time_in_force) -> Dict:
+            rate: float, time_in_force: str) -> Dict:
 
         if self._config['dry_run']:
             dry_order = self.dry_run_order(pair, ordertype, "buy", amount, rate)
@@ -507,7 +513,7 @@ class Exchange:
         return self.create_order(pair, ordertype, 'buy', amount, rate, params)
 
     def sell(self, pair: str, ordertype: str, amount: float,
-             rate: float, time_in_force='gtc') -> Dict:
+             rate: float, time_in_force: str = 'gtc') -> Dict:
 
         if self._config['dry_run']:
             dry_order = self.dry_run_order(pair, ordertype, "sell", amount, rate)
@@ -976,8 +982,8 @@ class Exchange:
             raise OperationalException(e) from e
 
     @retrier
-    def get_fee(self, symbol, type='', side='', amount=1,
-                price=1, taker_or_maker='maker') -> float:
+    def get_fee(self, symbol: str, type: str = '', side: str = '', amount: float = 1,
+                price: float = 1, taker_or_maker: str = 'maker') -> float:
         try:
             # validate that markets are loaded before trying to get fee
             if self._api.markets is None or len(self._api.markets) == 0:
@@ -1000,7 +1006,7 @@ def get_exchange_bad_reason(exchange_name: str) -> str:
     return BAD_EXCHANGES.get(exchange_name, "")
 
 
-def is_exchange_known_ccxt(exchange_name: str, ccxt_module=None) -> bool:
+def is_exchange_known_ccxt(exchange_name: str, ccxt_module: CcxtModuleType = None) -> bool:
     return exchange_name in ccxt_exchanges(ccxt_module)
 
 
@@ -1008,14 +1014,14 @@ def is_exchange_officially_supported(exchange_name: str) -> bool:
     return exchange_name in ['bittrex', 'binance']
 
 
-def ccxt_exchanges(ccxt_module=None) -> List[str]:
+def ccxt_exchanges(ccxt_module: CcxtModuleType = None) -> List[str]:
     """
     Return the list of all exchanges known to ccxt
     """
     return ccxt_module.exchanges if ccxt_module is not None else ccxt.exchanges
 
 
-def available_exchanges(ccxt_module=None) -> List[str]:
+def available_exchanges(ccxt_module: CcxtModuleType = None) -> List[str]:
     """
     Return exchanges available to the bot, i.e. non-bad exchanges in the ccxt list
     """
@@ -1075,7 +1081,8 @@ def timeframe_to_next_date(timeframe: str, date: datetime = None) -> datetime:
     return datetime.fromtimestamp(new_timestamp, tz=timezone.utc)
 
 
-def symbol_is_pair(market_symbol: str, base_currency: str = None, quote_currency: str = None):
+def symbol_is_pair(market_symbol: str, base_currency: str = None,
+                   quote_currency: str = None) -> bool:
     """
     Check if the market symbol is a pair, i.e. that its symbol consists of the base currency and the
     quote currency separated by '/' character. If base_currency and/or quote_currency is passed,
@@ -1088,7 +1095,7 @@ def symbol_is_pair(market_symbol: str, base_currency: str = None, quote_currency
             (symbol_parts[1] == quote_currency if quote_currency else len(symbol_parts[1]) > 0))
 
 
-def market_is_active(market):
+def market_is_active(market: Dict) -> bool:
     """
     Return True if the market is active.
     """
diff --git a/freqtrade/freqtradebot.py b/freqtrade/freqtradebot.py
index aac501054..34dbca38e 100644
--- a/freqtrade/freqtradebot.py
+++ b/freqtrade/freqtradebot.py
@@ -265,7 +265,7 @@ class FreqtradeBot:
 
         return used_rate
 
-    def get_trade_stake_amount(self, pair) -> float:
+    def get_trade_stake_amount(self, pair: str) -> float:
         """
         Calculate stake amount for the trade
         :return: float: Stake amount
@@ -539,7 +539,7 @@ class FreqtradeBot:
 
         return True
 
-    def _notify_buy(self, trade: Trade, order_type: str):
+    def _notify_buy(self, trade: Trade, order_type: str) -> None:
         """
         Sends rpc notification when a buy occured.
         """
@@ -735,7 +735,7 @@ class FreqtradeBot:
 
         return False
 
-    def handle_trailing_stoploss_on_exchange(self, trade: Trade, order):
+    def handle_trailing_stoploss_on_exchange(self, trade: Trade, order: dict) -> None:
         """
         Check to see if stoploss on exchange should be updated
         in case of trailing stoploss on exchange
@@ -758,10 +758,8 @@ class FreqtradeBot:
                                      f"for pair {trade.pair}")
 
                 # Create new stoploss order
-                if self.create_stoploss_order(trade=trade, stop_price=trade.stop_loss,
-                                              rate=trade.stop_loss):
-                    return False
-                else:
+                if not self.create_stoploss_order(trade=trade, stop_price=trade.stop_loss,
+                                                  rate=trade.stop_loss):
                     logger.warning(f"Could not create trailing stoploss order "
                                    f"for pair {trade.pair}.")
 
@@ -990,7 +988,7 @@ class FreqtradeBot:
 
         self._notify_sell(trade, order_type)
 
-    def _notify_sell(self, trade: Trade, order_type: str):
+    def _notify_sell(self, trade: Trade, order_type: str) -> None:
         """
         Sends rpc notification when a sell occured.
         """
@@ -1031,7 +1029,7 @@ class FreqtradeBot:
 # Common update trade state methods
 #
 
-    def update_trade_state(self, trade, action_order: dict = None):
+    def update_trade_state(self, trade: Trade, action_order: dict = None) -> None:
         """
         Checks trades with open orders and updates the amount if necessary
         """
diff --git a/freqtrade/misc.py b/freqtrade/misc.py
index bcba78cf0..2a981c249 100644
--- a/freqtrade/misc.py
+++ b/freqtrade/misc.py
@@ -6,6 +6,7 @@ import logging
 import re
 from datetime import datetime
 from pathlib import Path
+from typing import Any
 from typing.io import IO
 
 import numpy as np
@@ -40,7 +41,7 @@ def datesarray_to_datetimearray(dates: np.ndarray) -> np.ndarray:
     return dates.dt.to_pydatetime()
 
 
-def file_dump_json(filename: Path, data, is_zip=False) -> None:
+def file_dump_json(filename: Path, data: Any, is_zip: bool = False) -> None:
     """
     Dump JSON data into a file
     :param filename: file to create
@@ -61,7 +62,7 @@ def file_dump_json(filename: Path, data, is_zip=False) -> None:
     logger.debug(f'done json to "{filename}"')
 
 
-def json_load(datafile: IO):
+def json_load(datafile: IO) -> Any:
     """
     load data with rapidjson
     Use this to have a consistent experience,
@@ -125,11 +126,11 @@ def round_dict(d, n):
     return {k: (round(v, n) if isinstance(v, float) else v) for k, v in d.items()}
 
 
-def plural(num, singular: str, plural: str = None) -> str:
+def plural(num: float, singular: str, plural: str = None) -> str:
     return singular if (num == 1 or num == -1) else plural or singular + 's'
 
 
-def render_template(templatefile: str, arguments: dict = {}):
+def render_template(templatefile: str, arguments: dict = {}) -> str:
 
     from jinja2 import Environment, PackageLoader, select_autoescape
 
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index cdf74f65f..ef493e240 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -9,6 +9,7 @@ from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Any, Dict, List, NamedTuple, Optional
 
+import arrow
 from pandas import DataFrame
 
 from freqtrade.configuration import (TimeRange, remove_credentials,
@@ -24,7 +25,7 @@ from freqtrade.optimize.optimize_reports import (
 from freqtrade.persistence import Trade
 from freqtrade.resolvers import ExchangeResolver, StrategyResolver
 from freqtrade.state import RunMode
-from freqtrade.strategy.interface import IStrategy, SellType
+from freqtrade.strategy.interface import IStrategy, SellCheckTuple, SellType
 
 logger = logging.getLogger(__name__)
 
@@ -148,7 +149,7 @@ class Backtesting:
             logger.info(f'Dumping backtest results to {recordfilename}')
             file_dump_json(recordfilename, records)
 
-    def _get_ticker_list(self, processed) -> Dict[str, DataFrame]:
+    def _get_ticker_list(self, processed: Dict) -> Dict[str, DataFrame]:
         """
         Helper function to convert a processed tickerlist into a list for performance reasons.
 
@@ -175,7 +176,8 @@ class Backtesting:
             ticker[pair] = [x for x in ticker_data.itertuples()]
         return ticker
 
-    def _get_close_rate(self, sell_row, trade: Trade, sell, trade_dur) -> float:
+    def _get_close_rate(self, sell_row, trade: Trade, sell: SellCheckTuple,
+                        trade_dur: int) -> float:
         """
         Get close rate for backtesting result
         """
@@ -280,7 +282,7 @@ class Backtesting:
         return None
 
     def backtest(self, processed: Dict, stake_amount: float,
-                 start_date, end_date,
+                 start_date: arrow.Arrow, end_date: arrow.Arrow,
                  max_open_trades: int = 0, position_stacking: bool = False) -> DataFrame:
         """
         Implement backtesting functionality
diff --git a/freqtrade/optimize/hyperopt.py b/freqtrade/optimize/hyperopt.py
index 525f491f3..841f8b6db 100644
--- a/freqtrade/optimize/hyperopt.py
+++ b/freqtrade/optimize/hyperopt.py
@@ -117,11 +117,11 @@ class Hyperopt:
         self.print_json = self.config.get('print_json', False)
 
     @staticmethod
-    def get_lock_filename(config) -> str:
+    def get_lock_filename(config: Dict[str, Any]) -> str:
 
         return str(config['user_data_dir'] / 'hyperopt.lock')
 
-    def clean_hyperopt(self):
+    def clean_hyperopt(self) -> None:
         """
         Remove hyperopt pickle files to restart hyperopt.
         """
@@ -158,7 +158,7 @@ class Hyperopt:
                         f"saved to '{self.trials_file}'.")
 
     @staticmethod
-    def _read_trials(trials_file) -> List:
+    def _read_trials(trials_file: Path) -> List:
         """
         Read hyperopt trials file
         """
@@ -189,7 +189,7 @@ class Hyperopt:
         return result
 
     @staticmethod
-    def print_epoch_details(results, total_epochs, print_json: bool,
+    def print_epoch_details(results, total_epochs: int, print_json: bool,
                             no_header: bool = False, header_str: str = None) -> None:
         """
         Display details of the hyperopt result
@@ -218,7 +218,7 @@ class Hyperopt:
             Hyperopt._params_pretty_print(params, 'trailing', "Trailing stop:")
 
     @staticmethod
-    def _params_update_for_json(result_dict, params, space: str):
+    def _params_update_for_json(result_dict, params, space: str) -> None:
         if space in params:
             space_params = Hyperopt._space_params(params, space)
             if space in ['buy', 'sell']:
@@ -235,7 +235,7 @@ class Hyperopt:
                 result_dict.update(space_params)
 
     @staticmethod
-    def _params_pretty_print(params, space: str, header: str):
+    def _params_pretty_print(params, space: str, header: str) -> None:
         if space in params:
             space_params = Hyperopt._space_params(params, space, 5)
             if space == 'stoploss':
@@ -251,7 +251,7 @@ class Hyperopt:
         return round_dict(d, r) if r else d
 
     @staticmethod
-    def is_best_loss(results, current_best_loss) -> bool:
+    def is_best_loss(results, current_best_loss: float) -> bool:
         return results['loss'] < current_best_loss
 
     def print_results(self, results) -> None:
@@ -438,7 +438,7 @@ class Hyperopt:
             random_state=self.random_state,
         )
 
-    def fix_optimizer_models_list(self):
+    def fix_optimizer_models_list(self) -> None:
         """
         WORKAROUND: Since skopt is not actively supported, this resolves problems with skopt
         memory usage, see also: https://github.com/scikit-optimize/scikit-optimize/pull/746
@@ -460,7 +460,7 @@ class Hyperopt:
                         wrap_non_picklable_objects(self.generate_optimizer))(v, i) for v in asked)
 
     @staticmethod
-    def load_previous_results(trials_file) -> List:
+    def load_previous_results(trials_file: Path) -> List:
         """
         Load data for epochs from the file if we have one
         """
diff --git a/freqtrade/pairlist/IPairList.py b/freqtrade/pairlist/IPairList.py
index d722e70f5..1ad4da523 100644
--- a/freqtrade/pairlist/IPairList.py
+++ b/freqtrade/pairlist/IPairList.py
@@ -7,7 +7,7 @@ Provides lists as configured in config.json
 import logging
 from abc import ABC, abstractmethod, abstractproperty
 from copy import deepcopy
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from freqtrade.exchange import market_is_active
 
@@ -16,7 +16,8 @@ logger = logging.getLogger(__name__)
 
 class IPairList(ABC):
 
-    def __init__(self, exchange, pairlistmanager, config, pairlistconfig: dict,
+    def __init__(self, exchange, pairlistmanager,
+                 config: Dict[str, Any], pairlistconfig: Dict[str, Any],
                  pairlist_pos: int) -> None:
         """
         :param exchange: Exchange instance
diff --git a/freqtrade/pairlist/PrecisionFilter.py b/freqtrade/pairlist/PrecisionFilter.py
index 5d364795d..f16458ca5 100644
--- a/freqtrade/pairlist/PrecisionFilter.py
+++ b/freqtrade/pairlist/PrecisionFilter.py
@@ -48,10 +48,10 @@ class PrecisionFilter(IPairList):
         """
         Filters and sorts pairlists and assigns and returns them again.
         """
-        stoploss = None
-        if self._config.get('stoploss') is not None:
+        stoploss = self._config.get('stoploss')
+        if stoploss is not None:
             # Precalculate sanitized stoploss value to avoid recalculation for every pair
-            stoploss = 1 - abs(self._config.get('stoploss'))
+            stoploss = 1 - abs(stoploss)
         # Copy list since we're modifying this list
         for p in deepcopy(pairlist):
             ticker = tickers.get(p)
diff --git a/freqtrade/pairlist/PriceFilter.py b/freqtrade/pairlist/PriceFilter.py
index b3546ebd9..dc02ae251 100644
--- a/freqtrade/pairlist/PriceFilter.py
+++ b/freqtrade/pairlist/PriceFilter.py
@@ -1,6 +1,6 @@
 import logging
 from copy import deepcopy
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
@@ -9,7 +9,8 @@ logger = logging.getLogger(__name__)
 
 class PriceFilter(IPairList):
 
-    def __init__(self, exchange, pairlistmanager, config, pairlistconfig: dict,
+    def __init__(self, exchange, pairlistmanager,
+                 config: Dict[str, Any], pairlistconfig: Dict[str, Any],
                  pairlist_pos: int) -> None:
         super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
 
diff --git a/freqtrade/pairlist/VolumePairList.py b/freqtrade/pairlist/VolumePairList.py
index 4ac9935ba..3b28cb7d1 100644
--- a/freqtrade/pairlist/VolumePairList.py
+++ b/freqtrade/pairlist/VolumePairList.py
@@ -6,7 +6,7 @@ Provides lists as configured in config.json
  """
 import logging
 from datetime import datetime
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from freqtrade.exceptions import OperationalException
 from freqtrade.pairlist.IPairList import IPairList
@@ -18,7 +18,7 @@ SORT_VALUES = ['askVolume', 'bidVolume', 'quoteVolume']
 
 class VolumePairList(IPairList):
 
-    def __init__(self, exchange, pairlistmanager, config, pairlistconfig: dict,
+    def __init__(self, exchange, pairlistmanager, config: Dict[str, Any], pairlistconfig: dict,
                  pairlist_pos: int) -> None:
         super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
 
@@ -77,7 +77,8 @@ class VolumePairList(IPairList):
         else:
             return pairlist
 
-    def _gen_pair_whitelist(self, pairlist, tickers, base_currency: str, key: str) -> List[str]:
+    def _gen_pair_whitelist(self, pairlist: List[str], tickers: Dict,
+                            base_currency: str, key: str) -> List[str]:
         """
         Updates the whitelist with with a dynamically generated list
         :param base_currency: base currency as str
diff --git a/freqtrade/persistence.py b/freqtrade/persistence.py
index 75116f1e3..5b0046091 100644
--- a/freqtrade/persistence.py
+++ b/freqtrade/persistence.py
@@ -64,11 +64,11 @@ def init(db_url: str, clean_open_orders: bool = False) -> None:
         clean_dry_run_db()
 
 
-def has_column(columns, searchname: str) -> bool:
+def has_column(columns: List, searchname: str) -> bool:
     return len(list(filter(lambda x: x["name"] == searchname, columns))) == 1
 
 
-def get_column_def(columns, column: str, default: str) -> str:
+def get_column_def(columns: List, column: str, default: str) -> str:
     return default if not has_column(columns, column) else column
 
 
@@ -246,14 +246,15 @@ class Trade(_DECL_BASE):
                                       if self.initial_stop_loss_pct else None),
         }
 
-    def adjust_min_max_rates(self, current_price: float):
+    def adjust_min_max_rates(self, current_price: float) -> None:
         """
         Adjust the max_rate and min_rate.
         """
         self.max_rate = max(current_price, self.max_rate or self.open_rate)
         self.min_rate = min(current_price, self.min_rate or self.open_rate)
 
-    def adjust_stop_loss(self, current_price: float, stoploss: float, initial: bool = False):
+    def adjust_stop_loss(self, current_price: float, stoploss: float,
+                         initial: bool = False) -> None:
         """
         This adjusts the stop loss to it's most recently observed setting
         :param current_price: Current rate the asset is traded
diff --git a/freqtrade/plot/plotting.py b/freqtrade/plot/plotting.py
index 5301d762d..943133ed0 100644
--- a/freqtrade/plot/plotting.py
+++ b/freqtrade/plot/plotting.py
@@ -370,7 +370,7 @@ def generate_profit_graph(pairs: str, tickers: Dict[str, pd.DataFrame],
     return fig
 
 
-def generate_plot_filename(pair, timeframe) -> str:
+def generate_plot_filename(pair: str, timeframe: str) -> str:
     """
     Generate filenames per pair/timeframe to be used for storing plots
     """
diff --git a/freqtrade/resolvers/iresolver.py b/freqtrade/resolvers/iresolver.py
index 5a844097c..3aec5f9e9 100644
--- a/freqtrade/resolvers/iresolver.py
+++ b/freqtrade/resolvers/iresolver.py
@@ -25,7 +25,7 @@ class IResolver:
     initial_search_path: Path
 
     @classmethod
-    def build_search_paths(cls, config, user_subdir: Optional[str] = None,
+    def build_search_paths(cls, config: Dict[str, Any], user_subdir: Optional[str] = None,
                            extra_dir: Optional[str] = None) -> List[Path]:
 
         abs_paths: List[Path] = [cls.initial_search_path]
diff --git a/freqtrade/resolvers/strategy_resolver.py b/freqtrade/resolvers/strategy_resolver.py
index 9e64f38df..015ba24d9 100644
--- a/freqtrade/resolvers/strategy_resolver.py
+++ b/freqtrade/resolvers/strategy_resolver.py
@@ -9,7 +9,7 @@ from base64 import urlsafe_b64decode
 from collections import OrderedDict
 from inspect import getfullargspec
 from pathlib import Path
-from typing import Dict, Optional
+from typing import Any, Dict, Optional
 
 from freqtrade.constants import (REQUIRED_ORDERTIF, REQUIRED_ORDERTYPES,
                                  USERPATH_STRATEGY)
@@ -30,7 +30,7 @@ class StrategyResolver(IResolver):
     initial_search_path = Path(__file__).parent.parent.joinpath('strategy').resolve()
 
     @staticmethod
-    def load_strategy(config: Optional[Dict] = None) -> IStrategy:
+    def load_strategy(config: Dict[str, Any] = None) -> IStrategy:
         """
         Load the custom class from config parameter
         :param config: configuration dictionary or None
@@ -96,7 +96,8 @@ class StrategyResolver(IResolver):
         return strategy
 
     @staticmethod
-    def _override_attribute_helper(strategy, config, attribute: str, default):
+    def _override_attribute_helper(strategy, config: Dict[str, Any],
+                                   attribute: str, default: Any):
         """
         Override attributes in the strategy.
         Prevalence:
diff --git a/freqtrade/rpc/rpc.py b/freqtrade/rpc/rpc.py
index 41097c211..7f5cfc101 100644
--- a/freqtrade/rpc/rpc.py
+++ b/freqtrade/rpc/rpc.py
@@ -139,7 +139,8 @@ class RPC:
                 results.append(trade_dict)
             return results
 
-    def _rpc_status_table(self, stake_currency, fiat_display_currency: str) -> Tuple[List, List]:
+    def _rpc_status_table(self, stake_currency: str,
+                          fiat_display_currency: str) -> Tuple[List, List]:
         trades = Trade.get_open_trades()
         if not trades:
             raise RPCException('no active trade')
@@ -385,7 +386,7 @@ class RPC:
 
         return {'status': 'No more buy will occur from now. Run /reload_conf to reset.'}
 
-    def _rpc_forcesell(self, trade_id) -> Dict[str, str]:
+    def _rpc_forcesell(self, trade_id: str) -> Dict[str, str]:
         """
         Handler for forcesell <id>.
         Sells the given trade at current price
diff --git a/freqtrade/rpc/rpc_manager.py b/freqtrade/rpc/rpc_manager.py
index f687fe4d1..670275991 100644
--- a/freqtrade/rpc/rpc_manager.py
+++ b/freqtrade/rpc/rpc_manager.py
@@ -61,7 +61,7 @@ class RPCManager:
             except NotImplementedError:
                 logger.error(f"Message type {msg['type']} not implemented by handler {mod.name}.")
 
-    def startup_messages(self, config, pairlist) -> None:
+    def startup_messages(self, config: Dict[str, Any], pairlist) -> None:
         if config['dry_run']:
             self.send_msg({
                 'type': RPCMessageType.WARNING_NOTIFICATION,
diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index 27bc8280e..6e15c5183 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -180,7 +180,7 @@ class IStrategy(ABC):
         if pair not in self._pair_locked_until or self._pair_locked_until[pair] < until:
             self._pair_locked_until[pair] = until
 
-    def unlock_pair(self, pair) -> None:
+    def unlock_pair(self, pair: str) -> None:
         """
         Unlocks a pair previously locked using lock_pair.
         Not used by freqtrade itself, but intended to be used if users lock pairs
diff --git a/freqtrade/wallets.py b/freqtrade/wallets.py
index c52767162..dd5e34fe6 100644
--- a/freqtrade/wallets.py
+++ b/freqtrade/wallets.py
@@ -30,24 +30,21 @@ class Wallets:
         self._last_wallet_refresh = 0
         self.update()
 
-    def get_free(self, currency) -> float:
-
+    def get_free(self, currency: str) -> float:
         balance = self._wallets.get(currency)
         if balance and balance.free:
             return balance.free
         else:
             return 0
 
-    def get_used(self, currency) -> float:
-
+    def get_used(self, currency: str) -> float:
         balance = self._wallets.get(currency)
         if balance and balance.used:
             return balance.used
         else:
             return 0
 
-    def get_total(self, currency) -> float:
-
+    def get_total(self, currency: str) -> float:
         balance = self._wallets.get(currency)
         if balance and balance.total:
             return balance.total
@@ -87,7 +84,6 @@ class Wallets:
         self._wallets = _wallets
 
     def _update_live(self) -> None:
-
         balances = self._exchange.get_balances()
 
         for currency in balances:
diff --git a/freqtrade/worker.py b/freqtrade/worker.py
index 6da04b4a2..64cc97026 100755
--- a/freqtrade/worker.py
+++ b/freqtrade/worker.py
@@ -22,7 +22,7 @@ class Worker:
     Freqtradebot worker class
     """
 
-    def __init__(self, args: Dict[str, Any], config=None) -> None:
+    def __init__(self, args: Dict[str, Any], config: Dict[str, Any] = None) -> None:
         """
         Init all variables and objects the bot needs to work
         """