diff --git a/.gitignore b/.gitignore
index e5ac932f8..219a9fb40 100644
--- a/.gitignore
+++ b/.gitignore
@@ -90,3 +90,4 @@ target/
 .vscode
 
 .pytest_cache/
+.mypy_cache/
diff --git a/.travis.yml b/.travis.yml
index 6554f2095..1cff5c04b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ addons:
 install:
 - ./install_ta-lib.sh
 - export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
-- pip install --upgrade flake8 coveralls pytest-random-order
+- pip install --upgrade flake8 coveralls pytest-random-order mypy
 - pip install -r requirements.txt
 - pip install -e .
 jobs:
@@ -26,6 +26,7 @@ jobs:
       - cp config.json.example config.json
       - python freqtrade/main.py hyperopt -e 5
     - script: flake8 freqtrade
+    - script: mypy freqtrade
 after_success:
 - coveralls
 notifications:
diff --git a/freqtrade/analyze.py b/freqtrade/analyze.py
index dcb5376ce..5756b845c 100644
--- a/freqtrade/analyze.py
+++ b/freqtrade/analyze.py
@@ -12,7 +12,7 @@ from pandas import DataFrame, to_datetime
 from freqtrade import constants
 from freqtrade.exchange import get_ticker_history
 from freqtrade.persistence import Trade
-from freqtrade.strategy.resolver import StrategyResolver
+from freqtrade.strategy.resolver import StrategyResolver, IStrategy
 
 
 logger = logging.getLogger(__name__)
@@ -37,7 +37,7 @@ class Analyze(object):
         :param config: Bot configuration (use the one from Configuration())
         """
         self.config = config
-        self.strategy = StrategyResolver(self.config).strategy
+        self.strategy: IStrategy = StrategyResolver(self.config).strategy
 
     @staticmethod
     def parse_ticker_dataframe(ticker: list) -> DataFrame:
diff --git a/freqtrade/arguments.py b/freqtrade/arguments.py
index b61324ccc..97c3d8cb2 100644
--- a/freqtrade/arguments.py
+++ b/freqtrade/arguments.py
@@ -17,9 +17,9 @@ class Arguments(object):
     Arguments Class. Manage the arguments received by the cli
     """
 
-    def __init__(self, args: List[str], description: str):
+    def __init__(self, args: List[str], description: str) -> None:
         self.args = args
-        self.parsed_arg = None
+        self.parsed_arg: Optional[argparse.Namespace] = None
         self.parser = argparse.ArgumentParser(description=description)
 
     def _load_args(self) -> None:
@@ -211,7 +211,8 @@ class Arguments(object):
         self.hyperopt_options(hyperopt_cmd)
 
     @staticmethod
-    def parse_timerange(text: str) -> Optional[Tuple[List, int, int]]:
+    def parse_timerange(text: Optional[str]) -> Optional[Tuple[Tuple,
+                                                         Optional[int], Optional[int]]]:
         """
         Parse the value of the argument --timerange to determine what is the range desired
         :param text: value from --timerange
@@ -234,23 +235,23 @@ class Arguments(object):
             if match:  # Regex has matched
                 rvals = match.groups()
                 index = 0
-                start = None
-                stop = None
+                start: Optional[int] = None
+                stop: Optional[int] = None
                 if stype[0]:
-                    start = rvals[index]
+                    starts = rvals[index]
                     if stype[0] == 'date':
-                        start = int(start) if len(start) == 10 \
-                            else arrow.get(start, 'YYYYMMDD').timestamp
+                        start = int(starts) if len(starts) == 10 \
+                            else arrow.get(starts, 'YYYYMMDD').timestamp
                     else:
-                        start = int(start)
+                        start = int(starts)
                     index += 1
                 if stype[1]:
-                    stop = rvals[index]
+                    stops = rvals[index]
                     if stype[1] == 'date':
-                        stop = int(stop) if len(stop) == 10 \
-                            else arrow.get(stop, 'YYYYMMDD').timestamp
+                        stop = int(stops) if len(stops) == 10 \
+                            else arrow.get(stops, 'YYYYMMDD').timestamp
                     else:
-                        stop = int(stop)
+                        stop = int(stops)
                 return stype, start, stop
         raise Exception('Incorrect syntax for timerange "%s"' % text)
 
diff --git a/freqtrade/configuration.py b/freqtrade/configuration.py
index 03a25efb3..a800bde78 100644
--- a/freqtrade/configuration.py
+++ b/freqtrade/configuration.py
@@ -5,7 +5,7 @@ This module contains the configuration class
 import json
 import logging
 from argparse import Namespace
-from typing import Dict, Any
+from typing import Optional, Dict, Any
 from jsonschema import Draft4Validator, validate
 from jsonschema.exceptions import ValidationError, best_match
 import ccxt
@@ -23,7 +23,7 @@ class Configuration(object):
     """
     def __init__(self, args: Namespace) -> None:
         self.args = args
-        self.config = None
+        self.config: Optional[Dict[str, Any]] = None
 
     def load_config(self) -> Dict[str, Any]:
         """
@@ -192,7 +192,7 @@ class Configuration(object):
             validate(conf, constants.CONF_SCHEMA)
             return conf
         except ValidationError as exception:
-            logger.fatal(
+            logger.critical(
                 'Invalid configuration. See config.json.example. Reason: %s',
                 exception
             )
diff --git a/freqtrade/exchange/__init__.py b/freqtrade/exchange/__init__.py
index 109e3f7b2..b186f3611 100644
--- a/freqtrade/exchange/__init__.py
+++ b/freqtrade/exchange/__init__.py
@@ -290,7 +290,7 @@ def get_ticker_history(pair: str, tick_interval: str, since_ms: Optional[int] =
         # chached data was already downloaded
         till_time_ms = min(till_time_ms, arrow.utcnow().shift(minutes=-10).timestamp * 1000)
 
-        data = []
+        data: List[Dict[Any, Any]] = []
         while not since_ms or since_ms < till_time_ms:
             data_part = _API.fetch_ohlcv(pair, timeframe=tick_interval, since=since_ms)
 
diff --git a/freqtrade/fiat_convert.py b/freqtrade/fiat_convert.py
index 17882f51a..88eb702c9 100644
--- a/freqtrade/fiat_convert.py
+++ b/freqtrade/fiat_convert.py
@@ -5,7 +5,7 @@ e.g BTC to USD
 
 import logging
 import time
-from typing import Dict
+from typing import Dict, List
 
 from coinmarketcap import Market
 from requests.exceptions import RequestException
@@ -34,7 +34,7 @@ class CryptoFiat(object):
         self.price = 0.0
 
         # Private attributes
-        self._expiration = 0
+        self._expiration = 0.0
 
         self.crypto_symbol = crypto_symbol.upper()
         self.fiat_symbol = fiat_symbol.upper()
@@ -65,7 +65,7 @@ class CryptoToFiatConverter(object):
     This object is also a Singleton
     """
     __instance = None
-    _coinmarketcap = None
+    _coinmarketcap: Market = None
 
     # Constants
     SUPPORTED_FIAT = [
@@ -87,7 +87,7 @@ class CryptoToFiatConverter(object):
         return CryptoToFiatConverter.__instance
 
     def __init__(self) -> None:
-        self._pairs = []
+        self._pairs: List[CryptoFiat] = []
         self._load_cryptomap()
 
     def _load_cryptomap(self) -> None:
diff --git a/freqtrade/freqtradebot.py b/freqtrade/freqtradebot.py
index 7c955d423..41841e911 100644
--- a/freqtrade/freqtradebot.py
+++ b/freqtrade/freqtradebot.py
@@ -33,7 +33,7 @@ class FreqtradeBot(object):
     This is from here the bot start its logic.
     """
 
-    def __init__(self, config: Dict[str, Any], db_url: Optional[str] = None):
+    def __init__(self, config: Dict[str, Any], db_url: Optional[str] = None)-> None:
         """
         Init all variables and object the bot need to work
         :param config: configuration dict, you can use the Configuration.get_config()
@@ -51,9 +51,9 @@ class FreqtradeBot(object):
 
         # Init objects
         self.config = config
-        self.analyze = None
-        self.fiat_converter = None
-        self.rpc = None
+        self.analyze = Analyze(self.config)
+        self.fiat_converter = CryptoToFiatConverter()
+        self.rpc: RPCManager = RPCManager(self)
         self.persistence = None
         self.exchange = None
 
@@ -66,9 +66,6 @@ class FreqtradeBot(object):
         :return: None
         """
         # Initialize all modules
-        self.analyze = Analyze(self.config)
-        self.fiat_converter = CryptoToFiatConverter()
-        self.rpc = RPCManager(self)
 
         persistence.init(self.config, db_url)
         exchange.init(self.config)
@@ -93,7 +90,7 @@ class FreqtradeBot(object):
         persistence.cleanup()
         return True
 
-    def worker(self, old_state: None) -> State:
+    def worker(self, old_state: State = None) -> State:
         """
         Trading routine that must be run at each loop
         :param old_state: the previous service state from the previous call
diff --git a/freqtrade/indicator_helpers.py b/freqtrade/indicator_helpers.py
index 14519d7a2..50586578a 100644
--- a/freqtrade/indicator_helpers.py
+++ b/freqtrade/indicator_helpers.py
@@ -13,7 +13,7 @@ def went_down(series: Series) -> bool:
     return series < series.shift(1)
 
 
-def ehlers_super_smoother(series: Series, smoothing: float = 6) -> type(Series):
+def ehlers_super_smoother(series: Series, smoothing: float = 6) -> Series:
     magic = pi * sqrt(2) / smoothing
     a1 = exp(-magic)
     coeff2 = 2 * a1 * cos(magic)
diff --git a/freqtrade/misc.py b/freqtrade/misc.py
index 225fb32df..90a1db42b 100644
--- a/freqtrade/misc.py
+++ b/freqtrade/misc.py
@@ -83,7 +83,7 @@ def file_dump_json(filename, data, is_zip=False) -> None:
             json.dump(data, fp, default=str)
 
 
-def format_ms_time(date: str) -> str:
+def format_ms_time(date: int) -> str:
     """
     convert MS date to readable format.
     : epoch-string in ms
diff --git a/freqtrade/optimize/__init__.py b/freqtrade/optimize/__init__.py
index 19e235a7a..711adfd28 100644
--- a/freqtrade/optimize/__init__.py
+++ b/freqtrade/optimize/__init__.py
@@ -4,8 +4,8 @@ import gzip
 import json
 import logging
 import os
+from typing import Optional, List, Dict, Tuple, Any
 import arrow
-from typing import Optional, List, Dict, Tuple
 
 from freqtrade import misc, constants
 from freqtrade.exchange import get_ticker_history
@@ -144,7 +144,9 @@ def download_pairs(datadir, pairs: List[str],
 
 def load_cached_data_for_updating(filename: str,
                                   tick_interval: str,
-                                  timerange: Optional[Tuple[Tuple, int, int]]) -> Tuple[list, int]:
+                                  timerange: Optional[Tuple[Tuple, int, int]]) -> Tuple[
+                                                                                  List[Any],
+                                                                                  Optional[int]]:
     """
     Load cached data and choose what part of the data should be updated
     """
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index ab45b7754..1d560d309 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -33,18 +33,6 @@ class Backtesting(object):
     """
     def __init__(self, config: Dict[str, Any]) -> None:
         self.config = config
-        self.analyze = None
-        self.ticker_interval = None
-        self.tickerdata_to_dataframe = None
-        self.populate_buy_trend = None
-        self.populate_sell_trend = None
-        self._init()
-
-    def _init(self) -> None:
-        """
-        Init objects required for backtesting
-        :return: None
-        """
         self.analyze = Analyze(self.config)
         self.ticker_interval = self.analyze.strategy.ticker_interval
         self.tickerdata_to_dataframe = self.analyze.tickerdata_to_dataframe
@@ -78,7 +66,7 @@ class Backtesting(object):
         Generates and returns a text table for the given backtest data and the results dataframe
         :return: pretty printed table with tabulate as str
         """
-        stake_currency = self.config.get('stake_currency')
+        stake_currency = str(self.config.get('stake_currency'))
 
         floatfmt = ('s', 'd', '.2f', '.8f', '.1f')
         tabular_data = []
@@ -168,7 +156,7 @@ class Backtesting(object):
         record = args.get('record', None)
         records = []
         trades = []
-        trade_count_lock = {}
+        trade_count_lock: Dict = {}
         for pair, pair_data in processed.items():
             pair_data['buy'], pair_data['sell'] = 0, 0  # cleanup from previous run
 
@@ -230,8 +218,9 @@ class Backtesting(object):
         else:
             logger.info('Using local backtesting data (using whitelist in given config) ...')
 
-            timerange = Arguments.parse_timerange(self.config.get('timerange'))
-            data = optimize.load_data(
+            timerange = Arguments.parse_timerange(None if self.config.get(
+                'timerange') is None else str(self.config.get('timerange')))
+            data = optimize.load_data(  # type: ignore # timerange will be refactored
                 self.config['datadir'],
                 pairs=pairs,
                 ticker_interval=self.ticker_interval,
diff --git a/freqtrade/optimize/hyperopt.py b/freqtrade/optimize/hyperopt.py
index f815c85a4..74b39b445 100644
--- a/freqtrade/optimize/hyperopt.py
+++ b/freqtrade/optimize/hyperopt.py
@@ -14,7 +14,7 @@ from argparse import Namespace
 from functools import reduce
 from math import exp
 from operator import itemgetter
-from typing import Dict, Any, Callable
+from typing import Dict, Any, Callable, Optional
 
 import numpy
 import talib.abstract as ta
@@ -60,7 +60,7 @@ class Hyperopt(Backtesting):
         self.expected_max_profit = 3.0
 
         # Configuration and data used by hyperopt
-        self.processed = None
+        self.processed: Optional[Dict[str, Any]] = None
 
         # Hyperopt Trials
         self.trials_file = os.path.join('user_data', 'hyperopt_trials.pickle')
@@ -344,7 +344,7 @@ class Hyperopt(Backtesting):
         """
         Return the space to use during Hyperopt
         """
-        spaces = {}
+        spaces: Dict = {}
         if self.has_space('buy'):
             spaces = {**spaces, **Hyperopt.indicator_space()}
         if self.has_space('roi'):
@@ -495,16 +495,17 @@ class Hyperopt(Backtesting):
                 )
 
     def start(self) -> None:
-        timerange = Arguments.parse_timerange(self.config.get('timerange'))
-        data = load_data(
-            datadir=self.config.get('datadir'),
+        timerange = Arguments.parse_timerange(None if self.config.get(
+            'timerange') is None else str(self.config.get('timerange')))
+        data = load_data(  # type: ignore # timerange will be refactored
+            datadir=str(self.config.get('datadir')),
             pairs=self.config['exchange']['pair_whitelist'],
             ticker_interval=self.ticker_interval,
             timerange=timerange
         )
 
         if self.has_space('buy'):
-            self.analyze.populate_indicators = Hyperopt.populate_indicators
+            self.analyze.populate_indicators = Hyperopt.populate_indicators  # type: ignore
         self.processed = self.tickerdata_to_dataframe(data)
 
         if self.config.get('mongodb'):
diff --git a/freqtrade/persistence.py b/freqtrade/persistence.py
index 2d497662e..f9a7d1e3c 100644
--- a/freqtrade/persistence.py
+++ b/freqtrade/persistence.py
@@ -5,7 +5,7 @@ This module contains the class to persist trades into SQLite
 import logging
 from datetime import datetime
 from decimal import Decimal, getcontext
-from typing import Dict, Optional
+from typing import Dict, Optional, Any
 
 import arrow
 from sqlalchemy import (Boolean, Column, DateTime, Float, Integer, String,
@@ -21,7 +21,7 @@ from sqlalchemy import inspect
 logger = logging.getLogger(__name__)
 
 _CONF = {}
-_DECL_BASE = declarative_base()
+_DECL_BASE: Any = declarative_base()
 
 
 def init(config: dict, engine: Optional[Engine] = None) -> None:
diff --git a/freqtrade/rpc/rpc.py b/freqtrade/rpc/rpc.py
index f972e64cc..f48666748 100644
--- a/freqtrade/rpc/rpc.py
+++ b/freqtrade/rpc/rpc.py
@@ -2,9 +2,9 @@
 This module contains class to define a RPC communications
 """
 import logging
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, date
 from decimal import Decimal
-from typing import Tuple, Any
+from typing import Dict, Tuple, Any
 
 import arrow
 import sqlalchemy as sql
@@ -114,7 +114,7 @@ class RPC(object):
             self, timescale: int,
             stake_currency: str, fiat_display_currency: str) -> Tuple[bool, Any]:
         today = datetime.utcnow().date()
-        profit_days = {}
+        profit_days: Dict[date, Dict] = {}
 
         if not (isinstance(timescale, int) and timescale > 0):
             return True, '*Daily [n]:* `must be an integer greater than 0`'
@@ -172,7 +172,7 @@ class RPC(object):
         durations = []
 
         for trade in trades:
-            current_rate = None
+            current_rate: float = 0.0
 
             if not trade.open_rate:
                 continue
@@ -278,7 +278,7 @@ class RPC(object):
         value = fiat.convert_amount(total, 'BTC', symbol)
         return False, (output, total, symbol, value)
 
-    def rpc_start(self) -> (bool, str):
+    def rpc_start(self) -> Tuple[bool, str]:
         """
         Handler for start.
         """
@@ -288,7 +288,7 @@ class RPC(object):
         self.freqtrade.state = State.RUNNING
         return False, '`Starting trader ...`'
 
-    def rpc_stop(self) -> (bool, str):
+    def rpc_stop(self) -> Tuple[bool, str]:
         """
         Handler for stop.
         """
diff --git a/freqtrade/rpc/rpc_manager.py b/freqtrade/rpc/rpc_manager.py
index 0299c793a..58e9bf2b9 100644
--- a/freqtrade/rpc/rpc_manager.py
+++ b/freqtrade/rpc/rpc_manager.py
@@ -1,6 +1,7 @@
 """
 This module contains class to manage RPC communications (Telegram, Slack, ...)
 """
+from typing import Any, List
 import logging
 
 from freqtrade.rpc.telegram import Telegram
@@ -21,8 +22,8 @@ class RPCManager(object):
         """
         self.freqtrade = freqtrade
 
-        self.registered_modules = []
-        self.telegram = None
+        self.registered_modules: List[str] = []
+        self.telegram: Any = None
         self._init()
 
     def _init(self) -> None:
diff --git a/freqtrade/rpc/telegram.py b/freqtrade/rpc/telegram.py
index c640fc77b..c110b9627 100644
--- a/freqtrade/rpc/telegram.py
+++ b/freqtrade/rpc/telegram.py
@@ -18,7 +18,7 @@ from freqtrade.rpc.rpc import RPC
 logger = logging.getLogger(__name__)
 
 
-def authorized_only(command_handler: Callable[[Bot, Update], None]) -> Callable[..., Any]:
+def authorized_only(command_handler: Callable[[Any, Bot, Update], None]) -> Callable[..., Any]:
     """
     Decorator to check if the message comes from the correct chat_id
     :param command_handler: Telegram CommandHandler
@@ -65,7 +65,7 @@ class Telegram(RPC):
         """
         super().__init__(freqtrade)
 
-        self._updater = None
+        self._updater: Updater = None
         self._config = freqtrade.config
         self._init()
 
diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index dcf665a02..4ae358c6f 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -2,7 +2,7 @@
 IStrategy interface
 This module defines the interface to apply for strategies
 """
-
+from typing import Dict
 from abc import ABC, abstractmethod
 
 from pandas import DataFrame
@@ -16,9 +16,13 @@ class IStrategy(ABC):
     Attributes you can use:
         minimal_roi -> Dict: Minimal ROI designed for the strategy
         stoploss -> float: optimal stoploss designed for the strategy
-        ticker_interval -> int: value of the ticker interval to use for the strategy
+        ticker_interval -> str: value of the ticker interval to use for the strategy
     """
 
+    minimal_roi: Dict
+    stoploss: float
+    ticker_interval: str
+
     @abstractmethod
     def populate_indicators(self, dataframe: DataFrame) -> DataFrame:
         """
diff --git a/freqtrade/strategy/resolver.py b/freqtrade/strategy/resolver.py
index 8f4972919..3fd39bca3 100644
--- a/freqtrade/strategy/resolver.py
+++ b/freqtrade/strategy/resolver.py
@@ -33,7 +33,8 @@ class StrategyResolver(object):
 
         # Verify the strategy is in the configuration, otherwise fallback to the default strategy
         strategy_name = config.get('strategy') or constants.DEFAULT_STRATEGY
-        self.strategy = self._load_strategy(strategy_name, extra_dir=config.get('strategy_path'))
+        self.strategy: IStrategy = self._load_strategy(strategy_name,
+                                                       extra_dir=config.get('strategy_path'))
 
         # Set attributes
         # Check if we need to override configuration
@@ -61,7 +62,7 @@ class StrategyResolver(object):
         self.strategy.stoploss = float(self.strategy.stoploss)
 
     def _load_strategy(
-            self, strategy_name: str, extra_dir: Optional[str] = None) -> Optional[IStrategy]:
+            self, strategy_name: str, extra_dir: Optional[str] = None) -> IStrategy:
         """
         Search and loads the specified strategy.
         :param strategy_name: name of the module to import
@@ -101,7 +102,7 @@ class StrategyResolver(object):
         # Generate spec based on absolute path
         spec = importlib.util.spec_from_file_location('user_data.strategies', module_path)
         module = importlib.util.module_from_spec(spec)
-        spec.loader.exec_module(module)
+        spec.loader.exec_module(module)  # type: ignore # importlib does not use typehints
 
         valid_strategies_gen = (
             obj for name, obj in inspect.getmembers(module, inspect.isclass)
diff --git a/freqtrade/tests/optimize/test_backtesting.py b/freqtrade/tests/optimize/test_backtesting.py
index 786568f98..1b1872404 100644
--- a/freqtrade/tests/optimize/test_backtesting.py
+++ b/freqtrade/tests/optimize/test_backtesting.py
@@ -286,23 +286,6 @@ def test_start(mocker, fee, default_conf, caplog) -> None:
     assert start_mock.call_count == 1
 
 
-def test_backtesting__init__(mocker, default_conf) -> None:
-    """
-    Test Backtesting.__init__() method
-    """
-    init_mock = MagicMock()
-    mocker.patch('freqtrade.optimize.backtesting.Backtesting._init', init_mock)
-
-    backtesting = Backtesting(default_conf)
-    assert backtesting.config == default_conf
-    assert backtesting.analyze is None
-    assert backtesting.ticker_interval is None
-    assert backtesting.tickerdata_to_dataframe is None
-    assert backtesting.populate_buy_trend is None
-    assert backtesting.populate_sell_trend is None
-    assert init_mock.call_count == 1
-
-
 def test_backtesting_init(mocker, default_conf) -> None:
     """
     Test Backtesting._init() method
diff --git a/freqtrade/tests/test_configuration.py b/freqtrade/tests/test_configuration.py
index dcf725e83..492fdee70 100644
--- a/freqtrade/tests/test_configuration.py
+++ b/freqtrade/tests/test_configuration.py
@@ -6,6 +6,7 @@ Unit test file for configuration.py
 import json
 from copy import deepcopy
 from unittest.mock import MagicMock
+from argparse import Namespace
 
 import pytest
 from jsonschema import ValidationError
@@ -37,7 +38,7 @@ def test_load_config_invalid_pair(default_conf) -> None:
     conf['exchange']['pair_whitelist'].append('ETH-BTC')
 
     with pytest.raises(ValidationError, match=r'.*does not match.*'):
-        configuration = Configuration([])
+        configuration = Configuration(Namespace())
         configuration._validate_config(conf)
 
 
@@ -49,7 +50,7 @@ def test_load_config_missing_attributes(default_conf) -> None:
     conf.pop('exchange')
 
     with pytest.raises(ValidationError, match=r'.*\'exchange\' is a required property.*'):
-        configuration = Configuration([])
+        configuration = Configuration(Namespace())
         configuration._validate_config(conf)
 
 
@@ -61,7 +62,7 @@ def test_load_config_file(default_conf, mocker, caplog) -> None:
         read_data=json.dumps(default_conf)
     ))
 
-    configuration = Configuration([])
+    configuration = Configuration(Namespace())
     validated_conf = configuration._load_config_file('somefile')
     assert file_mock.call_count == 1
     assert validated_conf.items() >= default_conf.items()
@@ -79,7 +80,7 @@ def test_load_config_max_open_trades_zero(default_conf, mocker, caplog) -> None:
         read_data=json.dumps(conf)
     ))
 
-    Configuration([])._load_config_file('somefile')
+    Configuration(Namespace())._load_config_file('somefile')
     assert file_mock.call_count == 1
     assert log_has('Validating configuration ...', caplog.record_tuples)
 
@@ -92,7 +93,7 @@ def test_load_config_file_exception(mocker, caplog) -> None:
         'freqtrade.configuration.open',
         MagicMock(side_effect=FileNotFoundError('File not found'))
     )
-    configuration = Configuration([])
+    configuration = Configuration(Namespace())
 
     with pytest.raises(SystemExit):
         configuration._load_config_file('somefile')
@@ -128,13 +129,13 @@ def test_load_config_with_params(default_conf, mocker) -> None:
         read_data=json.dumps(default_conf)
     ))
 
-    args = [
+    arglist = [
         '--dynamic-whitelist', '10',
         '--strategy', 'TestStrategy',
         '--strategy-path', '/some/path',
         '--dry-run-db',
     ]
-    args = Arguments(args, '').get_parsed_arg()
+    args = Arguments(arglist, '').get_parsed_arg()
 
     configuration = Configuration(args)
     validated_conf = configuration.load_config()
@@ -174,12 +175,12 @@ def test_show_info(default_conf, mocker, caplog) -> None:
         read_data=json.dumps(default_conf)
     ))
 
-    args = [
+    arglist = [
         '--dynamic-whitelist', '10',
         '--strategy', 'TestStrategy',
         '--dry-run-db'
     ]
-    args = Arguments(args, '').get_parsed_arg()
+    args = Arguments(arglist, '').get_parsed_arg()
 
     configuration = Configuration(args)
     configuration.get_config()
@@ -202,8 +203,8 @@ def test_show_info(default_conf, mocker, caplog) -> None:
     )
 
     # Test the Dry run condition
-    configuration.config.update({'dry_run': False})
-    configuration._load_common_config(configuration.config)
+    configuration.config.update({'dry_run': False})  # type: ignore
+    configuration._load_common_config(configuration.config)  # type: ignore
     assert log_has(
         'Dry run is disabled. (--dry_run_db ignored)',
         caplog.record_tuples
@@ -218,13 +219,13 @@ def test_setup_configuration_without_arguments(mocker, default_conf, caplog) ->
         read_data=json.dumps(default_conf)
     ))
 
-    args = [
+    arglist = [
         '--config', 'config.json',
         '--strategy', 'DefaultStrategy',
         'backtesting'
     ]
 
-    args = Arguments(args, '').get_parsed_arg()
+    args = Arguments(arglist, '').get_parsed_arg()
 
     configuration = Configuration(args)
     config = configuration.get_config()
@@ -262,7 +263,7 @@ def test_setup_configuration_with_arguments(mocker, default_conf, caplog) -> Non
         read_data=json.dumps(default_conf)
     ))
 
-    args = [
+    arglist = [
         '--config', 'config.json',
         '--strategy', 'DefaultStrategy',
         '--datadir', '/foo/bar',
@@ -275,7 +276,7 @@ def test_setup_configuration_with_arguments(mocker, default_conf, caplog) -> Non
         '--export', '/bar/foo'
     ]
 
-    args = Arguments(args, '').get_parsed_arg()
+    args = Arguments(arglist, '').get_parsed_arg()
 
     configuration = Configuration(args)
     config = configuration.get_config()
@@ -326,14 +327,14 @@ def test_hyperopt_with_arguments(mocker, default_conf, caplog) -> None:
         read_data=json.dumps(default_conf)
     ))
 
-    args = [
+    arglist = [
         'hyperopt',
         '--epochs', '10',
         '--use-mongodb',
         '--spaces', 'all',
     ]
 
-    args = Arguments(args, '').get_parsed_arg()
+    args = Arguments(arglist, '').get_parsed_arg()
 
     configuration = Configuration(args)
     config = configuration.get_config()
@@ -357,7 +358,7 @@ def test_check_exchange(default_conf) -> None:
     Test the configuration validator with a missing attribute
     """
     conf = deepcopy(default_conf)
-    configuration = Configuration([])
+    configuration = Configuration(Namespace())
 
     # Test a valid exchange
     conf.get('exchange').update({'name': 'BITTREX'})
diff --git a/setup.cfg b/setup.cfg
index ba065a7c2..6ffad0824 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,3 +2,6 @@
 #ignore =
 max-line-length = 100
 max-complexity = 12
+
+[mypy]
+ignore_missing_imports = True