On Mon, Mar 25, 2013 at 10:24 PM, Shiyao Ma <i...@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
