code: def e164(number):
      '''
      Printable E.164 (The international public telecommunication numbering plan
      from ITU) numbers.
  
      :param number: string
  
      >>> print(e164(155542315678))
      +155542315678
      >>> print(e164('+31 20 5423 1567'))
      +312054231567
      '''
      if isinstance(number, six.integer_types):
          return e164('+%s' % number)
  
      elif isinstance(number, six.string_types):
          number = strip(number, '-. ()')
          if number.startswith('+'):
              number = number[1:]
  
          return u'+%s' % numbef e164(number):
      '''
      Printable E.164 (The international public telecommunication numbering plan
      from ITU) numbers.
  
      :param number: string
  
      >>> print(e164(155542315678))
      +155542315678
      >>> print(e164('+31 20 5423 1567'))
      +312054231567
      '''
      if isinstance(number, six.integer_types):
          return e164('+%s' % number)
  
      elif isinstance(number, six.string_types):
          number = strip(number, '-. ()')
          if number.startswith('+'):
              number = number[1:]
  
          return u'+%s' % number
docs: Printable E.164 (The international public telecommunication numbering plan
      from ITU) numbers.
  
      :param number: string
  
      >>> print(e164(155542315678))
      +155542315678
      >>> print(e164('+31 20 5423 1567'))
      +312054231567