How can i use a variable without define it ?
How can i use a variable without define it ? I have thought about the __import__ function, but the docs says "the __import__() function does not set the local variable named eggs"。 -- http://mail.python.org/mailman/listinfo/python-list
Re: How can i use a variable without define it ?
On 7月16日, 下午4时47分, Ben Finney <[EMAIL PROTECTED]>
wrote:
> zhw <[EMAIL PROTECTED]> writes:
> > How can i use a variable without define it ?
>
> What do you mean by "use"? That's so vague I can think of many
> possible interpretations.
>
> What do you mean by "variable"? That term carries a lot of baggage
> that doesn't apply in Python.
>
> Can you give a small, complete example that demonstrates the issue
> you're trying to solve?
>
> --
> \ “The face of a child can say it all, especially the mouth part |
> `\of the face.” ―Jack Handey |
> _o__) |
> Ben Finney
Thank you! Sorry for my poor english!
Here is a example that I want to complete:
>>> import sys, new
>>> context={"name":"david", "sex":"male"}
>>> sys.modules["foo"] = new.module("foo")
>>> import foo
>>> for attr in context:
setattr(foo, attr, context[attr])
>>> def bar():
# here is a error
# import * only allowed at module level
from foo import *
print name, sex
>>> bar()
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Re: How can i use a variable without define it ?
On 7月16日, 下午5时35分, Ben Finney <[EMAIL PROTECTED]>
wrote:
> zhw <[EMAIL PROTECTED]> writes:
> > Here is a example that I want to complete:
> > >>> import sys, new
> > >>> context={"name":"david", "sex":"male"}
>
> Here you have a set of values addressible by name.
>
> > >>> sys.modules["foo"] = new.module("foo")
>
> Why do you believe you need to create a module object?
>
> > >>> import foo
> > >>> for attr in context:
> >setattr(foo, attr, context[attr])
>
> This doesn't appear to get you anything that isn't already available
> with the 'context' mapping.
>
> > >>> def bar():
> > # here is a error
> > # import * only allowed at module level
> >from foo import *
> > print name, sex
>
> You can simply do:
>
> >>> context = {'name': "david", 'sex': "male"}
> >>> def bar():
> ... print context['name'], context['sex']
> ...
> >>> bar()
> david male
>
> Or, more flexible and more explicit:
>
> >>> foo = {'name': "david", 'sex': "male"}
> >>> def bar(context):
> ... print context['name'], context['sex']
> ...
> >>> bar(foo)
> david male
>
> What problem are you trying to solve?
I an sorry, I can't tell you.
If you can't give a solution, just ignore it!
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