Improve code quality

freqtrade/commands/analyze_commands.py

@@ -40,8 +40,8 @@ def setup_analyze_configuration(args: Dict[str, Any], method: RunMode) -> Dict[s
 
         if (not Path(signals_file).exists()):
             raise OperationalException(
-                (f"Cannot find latest backtest signals file: {signals_file}."
-                  "Run backtesting with `--export signals`.")
+                f"Cannot find latest backtest signals file: {signals_file}."
+                "Run backtesting with `--export signals`."
             )
 
     return config

freqtrade/optimize/hyperopt_tools.py

@@ -1,4 +1,3 @@
-import io
 import logging
 from copy import deepcopy
 from datetime import datetime, timezone
@@ -464,7 +463,7 @@ class HyperoptTools():
             return
 
         try:
-            io.open(csv_file, 'w+').close()
+            Path(csv_file).open('w+').close()
         except IOError:
             logger.error(f"Failed to create CSV file: {csv_file}")
             return

freqtrade/rpc/telegram.py

@@ -1340,7 +1340,7 @@ class Telegram(RPCHandler):
         message = tabulate({k: [v] for k, v in counts.items()},
                            headers=['current', 'max', 'total stake'],
                            tablefmt='simple')
-        message = "<pre>{}</pre>".format(message)
+        message = f"<pre>{message}</pre>"
         logger.debug(message)
         self._send_msg(message, parse_mode=ParseMode.HTML,
                        reload_able=True, callback_path="update_count",
@@ -1642,7 +1642,7 @@ class Telegram(RPCHandler):
             ])
         else:
             reply_markup = InlineKeyboardMarkup([[]])
-        msg += "\nUpdated: {}".format(datetime.now().ctime())
+        msg += f"\nUpdated: {datetime.now().ctime()}"
         if not query.message:
             return
         chat_id = query.message.chat_id

freqtrade/rpc/webhook.py

@@ -113,7 +113,7 @@ class Webhook(RPCHandler):
                     response = post(self._url, data=payload['data'],
                                     headers={'Content-Type': 'text/plain'})
                 else:
-                    raise NotImplementedError('Unknown format: {}'.format(self._format))
+                    raise NotImplementedError(f'Unknown format: {self._format}')
 
                 # Throw a RequestException if the post was not successful
                 response.raise_for_status()