text: from .string import String
  import re
  
  
  class Email(String):
      def input_error_for_value(self, value, operator=None):
          if type(value) != str:
              return f'Value must be a string for {self.name}'
          if re.search('^[a-z0-9]+[\._]?[a-z0-9]+[@]\w+[.]\w{2,3}$', value):
              return ''
          return 'Invalid email address'
  