python3 string format

Shiyao Ma i at introo.me
Tue Mar 26 11:51:10 CET 2013


Thx for your reply.
I am using pycharm and simply press "go to declaration" which directs me to
a py file, containing the following code:
def format(*args, **kwargs): # known special case of str.format
        """
        S.format(*args, **kwargs) -> string

        Return a formatted version of S, using substitutions from args and
kwargs.
        The substitutions are identified by braces ('{' and '}').
        """
        pass
I am curious how you find the corresponding c source code.

On Tue, Mar 26, 2013 at 2:16 PM, Ian Kelly <ian.g.kelly at gmail.com> wrote:

> On Mon, Mar 25, 2013 at 10:24 PM, Shiyao Ma <i at introo.me> wrote:
> > HI.
> > one thing confuses me.
> > It is said in the pep3101 that "{}".format (x) will invoke the method
> > x.__format__
> > However, I looked at the src of python3 and found:
> > in class str(object), the format simply contains a pass statement
> > in class int(object), things is the same.
>
> I don't know what source you're looking at.  In CPython, both of those
> types are implemented in C, not Python, so there would be no pass
> statements involved.
>
> The int.__format__ method is implemented at:
>
> http://hg.python.org/cpython/file/3c437e591499/Objects/longobject.c#l4373
>
> It mainly just calls the _PyLong_FormatAdvancedWriter function, which is
> at:
>
>
> http://hg.python.org/cpython/file/3c437e591499/Python/formatter_unicode.c#l1399
>
> The str.__format__ method similarly is implemented at:
>
>
> http://hg.python.org/cpython/file/3c437e591499/Objects/unicodeobject.c#l12851
>
> and calls the _PyUnicode_FormatAdvancedWriter function at:
>
>
> http://hg.python.org/cpython/file/3c437e591499/Python/formatter_unicode.c#l1363
> --
> http://mail.python.org/mailman/listinfo/python-list
>



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