More lint fixes (#198)

* autopep fixes

* remove unused imports

* fix plot_dataframe.py lint warnings

* make pep8 error fails the build

* two more line breakings

* matplotlib.use() must be called before pyplot import

.travis.yml

@@ -25,8 +25,9 @@ jobs:
     - script:
       - cp config.json.example config.json
       - python freqtrade/main.py hyperopt -e 5
+    - script: flake8 freqtrade
 after_success:
-- flake8 freqtrade && coveralls
+- coveralls
 notifications:
   slack:
     secure: 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

freqtrade/misc.py

@@ -168,8 +168,8 @@ def build_subcommands(parser: argparse.ArgumentParser) -> None:
     )
     backtesting_cmd.add_argument(
         '-r', '--refresh-pairs-cached',
-        help='refresh the pairs files in tests/testdata with the latest data from Bittrex. Use it if you want to \
-              run your backtesting with up-to-date data.',
+        help='refresh the pairs files in tests/testdata with the latest data from Bittrex. \
+              Use it if you want to run your backtesting with up-to-date data.',
         action='store_true',
         dest='refresh_pairs',
     )

freqtrade/optimize/__init__.py

@@ -13,7 +13,8 @@ from freqtrade.analyze import populate_indicators, parse_ticker_dataframe
 logger = logging.getLogger(__name__)
 
 
-def load_data(pairs: List[str], ticker_interval: int = 5, refresh_pairs: Optional[bool] = False) -> Dict[str, List]:
+def load_data(pairs: List[str], ticker_interval: int = 5,
+              refresh_pairs: Optional[bool] = False) -> Dict[str, List]:
     """
     Loads ticker history data for the given parameters
     :param ticker_interval: ticker interval in minutes
@@ -64,7 +65,7 @@ def download_pairs(pairs: List[str]) -> bool:
             for interval in [1, 5]:
                 download_backtesting_testdata(pair=pair, interval=interval)
         except BaseException:
-            logger.info('Impossible to download the pair: "{pair}", Interval: {interval} min'.format(
+            logger.info('Failed to download the pair: "{pair}", Interval: {interval} min'.format(
                 pair=pair,
                 interval=interval,
             ))

freqtrade/optimize/backtesting.py

@@ -140,7 +140,8 @@ def start(args):
             data[pair] = exchange.get_ticker_history(pair, args.ticker_interval)
     else:
         logger.info('Using local backtesting data (using whitelist in given config) ...')
-        data = load_data(pairs=pairs, ticker_interval=args.ticker_interval, refresh_pairs=args.refresh_pairs)
+        data = load_data(pairs=pairs, ticker_interval=args.ticker_interval,
+                         refresh_pairs=args.refresh_pairs)
 
         logger.info('Using stake_currency: %s ...', config['stake_currency'])
         logger.info('Using stake_amount: %s ...', config['stake_amount'])

freqtrade/optimize/hyperopt.py

@@ -232,7 +232,8 @@ def start(args):
     logger.info('Using config: %s ...', args.config)
     config = load_config(args.config)
     pairs = config['exchange']['pair_whitelist']
-    PROCESSED = optimize.preprocess(optimize.load_data(pairs=pairs, ticker_interval=args.ticker_interval))
+    PROCESSED = optimize.preprocess(optimize.load_data(
+        pairs=pairs, ticker_interval=args.ticker_interval))
 
     if args.mongodb:
         logger.info('Using mongodb ...')

freqtrade/tests/test_optimize_backtesting.py

@@ -1,15 +1,11 @@
 # pragma pylint: disable=missing-docstring,W0212
 
-from unittest.mock import MagicMock
-
 from freqtrade import exchange, optimize
 from freqtrade.exchange import Bittrex
 from freqtrade.optimize.backtesting import backtest
 from freqtrade.optimize.__init__ import testdata_path, download_pairs, download_backtesting_testdata
 import os
 
-import pytest
-
 
 def test_backtest(default_conf, mocker):
     mocker.patch.dict('freqtrade.main._CONF', default_conf)
@@ -30,6 +26,7 @@ def test_1min_ticker_interval(default_conf, mocker):
     results = backtest(default_conf, optimize.preprocess(data), 1, True)
     assert len(results) > 0
 
+
 def test_backtest_with_new_pair(default_conf, ticker_history, mocker):
     mocker.patch('freqtrade.optimize.get_ticker_history', return_value=ticker_history)
     mocker.patch.dict('freqtrade.main._CONF', default_conf)

scripts/plot_dataframe.py

@@ -3,7 +3,6 @@
 import matplotlib  # Install PYQT5 manually if you want to test this helper function
 matplotlib.use("Qt5Agg")
 import matplotlib.pyplot as plt
-
 from freqtrade import exchange, analyze
 
 
@@ -52,4 +51,3 @@ def plot_analyzed_dataframe(pair: str) -> None:
 
 if __name__ == '__main__':
     plot_analyzed_dataframe('BTC_ETH')
-