Follow PEP 484 - no implicit optionals

freqtrade/data/btanalysis.py

@@ -90,7 +90,8 @@ def get_latest_hyperopt_filename(directory: Union[Path, str]) -> str:
         return 'hyperopt_results.pickle'
 
 
-def get_latest_hyperopt_file(directory: Union[Path, str], predef_filename: str = None) -> Path:
+def get_latest_hyperopt_file(
+        directory: Union[Path, str], predef_filename: Optional[str] = None) -> Path:
     """
     Get latest hyperopt export based on '.last_result.json'.
     :param directory: Directory to search for last result
@@ -193,7 +194,7 @@ def get_backtest_resultlist(dirname: Path):
 
 
 def find_existing_backtest_stats(dirname: Union[Path, str], run_ids: Dict[str, str],
-                                 min_backtest_date: datetime = None) -> Dict[str, Any]:
+                                 min_backtest_date: Optional[datetime] = None) -> Dict[str, Any]:
     """
     Find existing backtest stats that match specified run IDs and load them.
     :param dirname: pathlib.Path object, or string pointing to the file.

freqtrade/data/dataprovider.py

@@ -281,7 +281,7 @@ class DataProvider:
     def historic_ohlcv(
         self,
         pair: str,
-        timeframe: str = None,
+        timeframe: Optional[str] = None,
         candle_type: str = ''
     ) -> DataFrame:
         """
@@ -333,7 +333,7 @@ class DataProvider:
     def get_pair_dataframe(
         self,
         pair: str,
-        timeframe: str = None,
+        timeframe: Optional[str] = None,
         candle_type: str = ''
     ) -> DataFrame:
         """
@@ -415,7 +415,7 @@ class DataProvider:
 
     def refresh(self,
                 pairlist: ListPairsWithTimeframes,
-                helping_pairs: ListPairsWithTimeframes = None) -> None:
+                helping_pairs: Optional[ListPairsWithTimeframes] = None) -> None:
         """
         Refresh data, called with each cycle
         """
@@ -439,7 +439,7 @@ class DataProvider:
     def ohlcv(
         self,
         pair: str,
-        timeframe: str = None,
+        timeframe: Optional[str] = None,
         copy: bool = True,
         candle_type: str = ''
     ) -> DataFrame:

freqtrade/data/history/history_utils.py

@@ -28,8 +28,8 @@ def load_pair_history(pair: str,
                       fill_up_missing: bool = True,
                       drop_incomplete: bool = False,
                       startup_candles: int = 0,
-                      data_format: str = None,
-                      data_handler: IDataHandler = None,
+                      data_format: Optional[str] = None,
+                      data_handler: Optional[IDataHandler] = None,
                       candle_type: CandleType = CandleType.SPOT
                       ) -> DataFrame:
     """
@@ -69,7 +69,7 @@ def load_data(datadir: Path,
               fail_without_data: bool = False,
               data_format: str = 'json',
               candle_type: CandleType = CandleType.SPOT,
-              user_futures_funding_rate: int = None,
+              user_futures_funding_rate: Optional[int] = None,
               ) -> Dict[str, DataFrame]:
     """
     Load ohlcv history data for a list of pairs.
@@ -116,7 +116,7 @@ def refresh_data(*, datadir: Path,
                  timeframe: str,
                  pairs: List[str],
                  exchange: Exchange,
-                 data_format: str = None,
+                 data_format: Optional[str] = None,
                  timerange: Optional[TimeRange] = None,
                  candle_type: CandleType,
                  ) -> None:
@@ -189,7 +189,7 @@ def _download_pair_history(pair: str, *,
                            timeframe: str = '5m',
                            process: str = '',
                            new_pairs_days: int = 30,
-                           data_handler: IDataHandler = None,
+                           data_handler: Optional[IDataHandler] = None,
                            timerange: Optional[TimeRange] = None,
                            candle_type: CandleType,
                            erase: bool = False,
@@ -272,7 +272,7 @@ def refresh_backtest_ohlcv_data(exchange: Exchange, pairs: List[str], timeframes
                                 datadir: Path, trading_mode: str,
                                 timerange: Optional[TimeRange] = None,
                                 new_pairs_days: int = 30, erase: bool = False,
-                                data_format: str = None,
+                                data_format: Optional[str] = None,
                                 prepend: bool = False,
                                 ) -> List[str]:
     """

freqtrade/data/history/idatahandler.py

@@ -418,8 +418,8 @@ def get_datahandlerclass(datatype: str) -> Type[IDataHandler]:
         raise ValueError(f"No datahandler for datatype {datatype} available.")
 
 
-def get_datahandler(datadir: Path, data_format: str = None,
-                    data_handler: IDataHandler = None) -> IDataHandler:
+def get_datahandler(datadir: Path, data_format: Optional[str] = None,
+                    data_handler: Optional[IDataHandler] = None) -> IDataHandler:
     """
     :param datadir: Folder to save data
     :param data_format: dataformat to use