Re: Problem with Axiom?

On Mon, 28 Aug 2006 06:29:05 -0400, "Chaz." <[email protected]> wrote:
>Jean-Paul Calderone wrote:
>>On Sun, 27 Aug 2006 16:51:28 -0400, "Chaz." <[email protected]> wrote:
>>>I am having a strange problem and I am not sure of exactly where the 
>>>problem lies. It could be my python code, it could be axiom, I just don't 
>>>know.
>>
>>Keeping a global Store like this is complex and error prone.  You should
>>instantiate a Store in a function, probably your main function, and then
>>pass it as an argument to the other parts of your program.
>>
>>The particular problem you are running into with the example code you
>>included is that bar is being imported by Store initialization, which
>>causes it to import globaldb before globaldb is set to anything.
>>
>>Jean-Paul
>>
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>
>Certainly your suggestion will allow me to overcome the problem but it 
>doesn't explain why, when 'wwGlobalDB' and 'wwLocalDB' are removed and the 
>code runs, that it works. Only when I don't delete it does it fail. This is 
>pretty strange.
>
>Suppose I have
>
>aa.py
>
>a = None
>def foo(b):
>         global a
>         a = b

Your axiom code is actually equivalent to a definition of foo which is
like:

    def _f(x):
        import b
        return x

    def foo(b):
        global a
        a = _f(b)

>
>b.py
>
>from aa import a
>
>def bar():
>         print a
>
>c.py
>
>import aa
>import b
>a.foo(23)
>b.bar()
>
>
>Why is this code incorrect? Wouldn't I see 23 printed?
>
>Chaz
>
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>