code: def ipv4(value):
      
      groups = value.split('.')
      if len(groups) != 4 or any(not x.isdigit() for x in groups):
          return False
      return all(0 <= int(part) < 256 for part in groups)
docs: Return whether or not given value is a valid IP version 4 address.
  
      This validator is based on `WTForms IPAddress validator`_
  
      .. _WTForms IPAddress validator:
         https://github.com/wtforms/wtforms/blob/master/wtforms/validators.py
  
      Examples::
  
          >>> ipv4('123.0.0.7')
          True
  
          >>> ipv4('900.80.70.11')
          ValidationFailure(func=ipv4, args={'value': '900.80.70.11'})
  
      .. versionadded:: 0.2
  
      :param value: IP address string to validate