On Tue, Dec 9, 2014 at 9:10 AM, bSneddon <[email protected]> wrote:
> I ran into an issue setting variables from a GUI module that imports a back
> end module. My approach was wrong obviously but what is the best way to set
> values in a back end module.
>
> #module name beTest.py
>
> cfg = { 'def' : 'blue'}
>
> def printDef(argT = cfg['def']):
> print argT
They're set when you define the function, and become attributes of the function.
If you want to lazily fetch the defaults, here's one common idiom:
def printDef(argT=None):
"""Print the argT value, defaults to cfg['def']"""
if argT is None: argT = cfg['def']
print(argT)
This depends on None not being a meaningful argument value, of course.
If you need to have any object at all able to be passed in, you'd need
to create a dedicated sentinel object, or use *args and unpack
yourself; but for a lot of cases, None works fine.
ChrisA
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