Brendan, good catch, I didn't notice Virgil's confusion earlier. I think
that is a good explanation. I remember getting very confused by all of that
stuff back when I started in Python. I think mostly because I don't know of
any other language that does argument handling like how Python does it. I
learned it all by "school-of-hard-knocks". Does anybody recommend a really
good online reference that explains the ins-and-outs of positional and
keyword arguments for newbies?
Cheers!
Ben Root
On Thu, Apr 23, 2015 at 1:00 PM, Brendan Barnwell <brenb...@brenbarn.net>
wrote:
> On 2015-04-23 03:22, Virgil Stokes wrote:
> >
> > 1. There are 3 positional arguments given for animation.FuncAnimation;
> > but, in the
> > API documentation for this class
> > (http://matplotlib.org/api/animation_api.html), only
> > two positional arguments are shown.
>
> One thing I think may be misleading you is that you seem to be
> misunderstanding how positional and keyword arguments work in Python.
> Specifying a default value for an argument in a function definition
> doesn't mean that you can *only* pass it by keyword when you call it.
> Any named argument can always be passed positionally or by keyword (in
> Python 2). For instance, if I define a function like this:
>
> def foo(a, b=2):
> print a+b
>
> I can still call it like this:
>
> foo(8, 10)
>
> I can even call it like this (passing both arguments as keywords "out of
> order")
>
> foo(b=10, a=8)
>
> Writing "b=2" in the function definition doesn't so much "make b a
> keyword argument" as just "specify a default value for b". So in the
> FuncAnimation documentation you mentioned, "frames" is not required to
> be a keyword argument, and can still be passed positionally. (In Python
> 3 there are keyword-only arguments, and even in Python 2 the variadic
> **kwargs syntax collects only keyword arguments, but those aren't
> involved as far as the "frame" argument here is concerned.)
>
> --
> Brendan Barnwell
> "Do not follow where the path may lead. Go, instead, where there is no
> path, and leave a trail."
> --author unknown
>
>
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