On Thu, Sep 30, 2010 at 3:07 AM, Walker <ebwal...@gmail.com> wrote:
>> sage: x = "this is x"
>> sage: y = "this is y"
>> sage: z = "this is z"
>> sage: def f():
>> ....: print x
>> ....: y = "new value"
>> ....: print y
>> ....: global z
>> ....: z = "new value"
>> ....: print z
>> ....:
>>
>> sage: f()
>> this is x
>> new value
>> new value
>>
>> sage: x, y, z
>> ('this is x', 'this is y', 'new value')
>
> Yes it's true, that's the behavior I was referring to. My problem was
> actually that I couldn't print a global variable inside a function
> before I made an assignment to it; the error was something like
> "Cannot istantiate a local variable before assigning it." and I didn't
> understand why I had to assign locally a global variable which had
> already been assigned globally. Anyway the keyword "global" solved my
> problem.
Yep, a variable is either local or global throughout the entire function.
- Robert
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