alex goretoy wrote:
> Sorry to have confused yall. What I meant was that you can do something
> like
> this, where the fucntion isn't called until it is bount to () with the
> right
> params
>
>>>> def a():
> ... print "inside a"
> ...
>>>> def b():
> ... print "inside b"
> ...
>>>> def c(a,b):
> ... a()
> ... b()
> ...
>>>> d={c:(a,b)}
>>>> d[c][0]()
> inside a
>>>> d[c][1]()
> inside b
>>>> d[c(d[c][0],d[c][1])]
> inside a
> inside b
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> KeyError: None
>
> where function a and b are bound in function c
what on earth are you talking about? you would get exactly the same
result with:
>>> def alpha():
... print('in alpha')
...
>>> def beta():
... print('in beta')
...
>>> def c(a, b):
... a()
... b()
...
>>> bollox=42
>>> d={bollox:(alpha, beta)}
>>> d[bollox][0]()
in alpha
>>> d[bollox][1]()
in beta
>>> d[c(d[bollox][0](),d[bollox][1]())]
in alpha
in beta
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in c
TypeError: 'NoneType' object is not callable
which is just the combination of:
>>> c(d[bollox][0],d[bollox][1])
in alpha
in beta
>>> d[None]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: None
"d" is only used, in "d[c(d[bollox][0](),d[bollox][1]())]" as a completely
normal lookup via bollox, and then to give an error when looking-up "None"
(the return value from c).
there is no special "binding" process.
andrew
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