code: def user_name(with_num=False):
      
      result = first_name()
      if with_num:
          result += str(random.randint(63, 94))
  
      return result.lower()
docs: Return a random user name.
  
      Basically it's lowercased result of
      :py:func:`~forgery_py.forgery.name.first_name()` with a number appended
      if `with_num`.