Refer Global Variables inside a Function | Python Tutorials | Learn Python

Use Global Variables in Function easily!
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Global Variables are something defined outside an entity which if needed to be referenced inside it, must be referenced using the "global" keyword.
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Example:
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testvar = 45;

def myfunction():
a = 10;
global testvar;
a = testvar + 10;
print(a);

myfunction();
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Here if the "global" keyword is not used, it will throw an error as testvar is not a local variable of the function.

The output is 55.