fixed printed message; cosmetic changes in the code in scripts/download_backtest_data.py

scripts/download_backtest_data.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
-
-"""This script generate json data"""
+"""
+This script generates json data
+"""
 import json
 import sys
 from pathlib import Path
@@ -35,7 +36,7 @@ if args.config:
     config: Dict[str, Any] = {}
     # Now expecting a list of config filenames here, not a string
     for path in args.config:
-        print('Using config: %s ...', path)
+        print(f"Using config: {path}...")
         # Merge config options, overwriting old values
         config = deep_merge_dicts(configuration._load_config_file(path), config)
 
@@ -44,7 +45,8 @@ if args.config:
     config['exchange']['key'] = ''
     config['exchange']['secret'] = ''
 else:
-    config = {'stake_currency': '',
+    config = {
+        'stake_currency': '',
         'dry_run': True,
         'exchange': {
             'name': args.exchange,
@@ -52,7 +54,7 @@ else:
             'secret': '',
             'pair_whitelist': [],
             'ccxt_async_config': {
-                      "enableRateLimit": False
+                'enableRateLimit': False
             }
         }
     }