Thomas wrote: > Hi, > > I sometimes find it useful to read the source code of a module and for > example I can type string.__file__ to find the location of the string > module. > > However the .__file__ method is not available for the module builtin. Is > it possible to read the source code for built in functions and if so how > do I find them? I realise some/all may be written in C rather than > python but it would still be interesting to read them.
It's all in C, see Python\bltinmodule.c in the source distribution. > > In an unrelated follow-up may I also ask: can the ellipsis (...) be used > in code? I tried a googlecode search but none of the examples worked for > me. Can someone post an example line of code that uses ... in it. > This has been causing an itch in my brain, please reply with the scratch. Syntactically ellipsis is allowed in a slice list as shown in the syntax definition here: http://docs.python.org/ref/slicings.html As a practical matter I think the only containers that actually support this kind of slicing are the arrays in Numeric and numpy. Here is a brief example: http://numpy.scipy.org//numpydoc/numpy-6.html#pgfId-36074 You could also support this syntax in a class of your own. Here is a simple example that just captures the argument to __getitem__() to show how the mechanism works: In [4]: class Foo(object): ...: def __getitem__(self, s): ...: self.s = s ...: return None ...: In [5]: f=Foo() In [6]: f[...,1] In [7]: f.s Out[7]: (Ellipsis, 1) Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
