Replace calls to load_data

freqtrade/optimize/backtesting.py

@@ -370,7 +370,7 @@ class Backtesting(object):
             timerange = Arguments.parse_timerange(None if self.config.get(
                 'timerange') is None else str(self.config.get('timerange')))
             data = history.load_data(
-                self.config['datadir'],
+                Path(self.config.get('datadir')) if self.config.get('datadir') else None,
                 pairs=pairs,
                 ticker_interval=self.ticker_interval,
                 refresh_pairs=self.config.get('refresh_pairs', False),

freqtrade/optimize/hyperopt.py

@@ -5,11 +5,12 @@ This module contains the hyperopt logic
 """
 
 import logging
-import multiprocessing
+from argparse import Namespace
 import os
 import sys
-from argparse import Namespace
+from pathlib import Path
 from math import exp
+import multiprocessing
 from operator import itemgetter
 from typing import Any, Dict, List
 
@@ -240,7 +241,7 @@ class Hyperopt(Backtesting):
         timerange = Arguments.parse_timerange(None if self.config.get(
             'timerange') is None else str(self.config.get('timerange')))
         data = load_data(
-            datadir=str(self.config.get('datadir')),
+            datadir=Path(self.config.get('datadir')) if self.config.get('datadir') else None,
             pairs=self.config['exchange']['pair_whitelist'],
             ticker_interval=self.ticker_interval,
             timerange=timerange