'Access the function's variable above the function

I have a variable defined in a function, but I want to access the variable in a for loop above the function. I have globalized the variable but still not working. Is there a way to access a function's variable in above the function? Below is a sample code demonstration.

for i in range(1):
    if a == 2:
       do_something()

def add():
    global a
    b = 1
    a = b + 1
    return a

add()

python

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'Access the function's variable above the function

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