After I declare a global variable and it is being modified in a function, I want to replace the default value of this global variable to the one modified after the function call. Is it possible?
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1Hi! Welcome to Stack Overflow! Please share a minimal reproducible example!jkalden– jkalden2016-01-20 09:34:36 +00:00Commented Jan 20, 2016 at 9:34
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2 Answers
A common mistake in python is misunderstanding how to use global - you don't declare the global in the outside scope but in the inside scope, basically confirming for python that you intend to treat the value as a global. An example:
foo = 1
def set_foo(value):
global foo
foo = value
print foo # prints 1
set_foo(2)
print foo # prints 2
You can see more information in the docs:
https://docs.python.org/release/2.7/reference/simple_stmts.html#global
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Example of using a global variable:
def func1():
global w
print(w)
w = 30
w = 10
func1() # 10
print(w) # 30
