On Fri, Oct 21, 2011 at 2:02 AM, Yingjie Lan <[email protected]> wrote:
> Oops, my former reply has the code indentation messed up
> by the mail system. Here is a reformatted one:
>
>
> What if the generator involves a variable from another scope,
> and before re-generating, the variable changed its value.
> Also, the generator could be passed in as an argument,
> so that we don't know its exact expression.
In the former case, use a named generator function and call it twice
to create two generators. In the latter case, don't pass in the
generator as an argument. Pass in a callable that constructs the
iterator instead. Modifying your example:
vo = 34
def mygen():
for x in range(3):
yield vo * x
def myfun(g):
global vo
for i in g(): print(i)
vo += 3
for i in g(): print(i)
myfun(mygen)
Cheers,
Ian
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