chore: apply ruff's pyupgrade linter rules to modernize Python code with targeted version (#2419)

api/libs/helper.py

@@ -1,4 +1,3 @@
-# -*- coding:utf-8 -*-
 import random
 import re
 import string
@@ -57,7 +56,7 @@ def timestamp_value(timestamp):
         raise ValueError(error)
 
 
-class str_len(object):
+class str_len:
     """ Restrict input to an integer in a range (inclusive) """
 
     def __init__(self, max_length, argument='argument'):
@@ -74,7 +73,7 @@ class str_len(object):
         return value
 
 
-class float_range(object):
+class float_range:
     """ Restrict input to an float in a range (inclusive) """
     def __init__(self, low, high, argument='argument'):
         self.low = low
@@ -91,7 +90,7 @@ class float_range(object):
         return value
 
 
-class datetime_string(object):
+class datetime_string:
     def __init__(self, format, argument='argument'):
         self.format = format
         self.argument = argument
@@ -111,7 +110,7 @@ def _get_float(value):
     try:
         return float(value)
     except (TypeError, ValueError):
-        raise ValueError('{0} is not a valid float'.format(value))
+        raise ValueError('{} is not a valid float'.format(value))
 
 def timezone(timezone_string):
     if timezone_string and timezone_string in available_timezones():