code: def sanitize(s, strict=True):
      
      allowed = ''.join(
          [
              'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
              'abcdefghijklmnopqrstuvwxyz',
              '0123456789',
          ]
      )
  
      if not strict:
          allowed += '-_.'
  
      s = str(s).replace(' ', '_')
  
      return ''.join([i for i in s if i in allowed])
docs: Sanitize a string.
  
      Spaces are converted to underscore; if strict=True they are then removed.
  
      Parameters
      ----------
      s : str
          String to sanitize
  
      strict : bool
          If True, only alphanumeric characters are allowed. If False, a limited
          set of additional characters (-._) will be allowed.