Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #79016 > unrolled thread

Re: TypeError: 'kwarg' is an invalid keyword argument for this function

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: TypeError: 'kwarg' is an invalid keyword argument for this function Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-12 12:45 -0600

#79016 — Re: TypeError: 'kwarg' is an invalid keyword argument for this function

On Sun, Oct 12, 2014 at 6:55 AM, roro codeath <rorocodeath@gmail.com> wrote:
> How to implement it in my class?
>
> class Str(str):
>     def __init__(self, *args, **kwargs):
>         pass
>
> Str('smth', kwarg='a')

The error is coming from the __new__ method. Because str is an
immutable type, you should override the __new__ method, not __init__.
Example:

class Str(str):
    def __new__(cls, *args, **kwargs):
        return super().__new__(cls, args[0])

>>> Str('smth', kwarg='a')
'smth'

[toc] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web