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Samuel Fernandes
Samuel Fernandes

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Posted on    May-14-2015 11:50 PM

 Python Python 
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If I create a global variable in one function, how can I use that variable in another function?
Do I need to store the global variable in a local variable of the function which needs its access?


Mayank Tripathi
Mayank Tripathi

Total Post:397

Points:3117
Posted on    May-15-2015 7:53 AM

You can use a global variable in other functions by declaring it as global in each function that assigns to it:

globvar = 0
def set_globvar_to_one():
    global globvar    # Needed to modify global copy of globvar
    globvar = 1
def print_globvar():
    print globvar     # No need for global declaration to read value of globvar
set_globvar_to_one()
print_globvar()       # Prints 1
I imagine the reason for it is that, since global variables are so dangerous, Python wants to make sure that you really know that's what you're playing with by explicitly requiring the global keyword.

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