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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