Python Scope

Published 2024-03-03

This is a note about python Scopes.

So there is a global scope everything which is outside of a function and there also local scope which is inside of a function.

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# they are threating each other as the different namespaces
temp = 'global'
def change():
    temp = 'local'
    print(temp) # 'local'
print(temp) # 'global'

def change():
    global temp
    temp = 'local'
print(temp) # local

If we want to overwrite this behaviour we should use global operator

The same behaviour we would see if we try to change a variable which is defined inside of a function.

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def main():
    temp = 'main local'
    def wrapper():
        temp = 'wrapper local'
        print("Inside of a wrapper", temp)
    wrapper() # Inside of a wrapper local temp
    print("Inside of main", temp) # Inside of main value

But if we want to access a variable, which is instantiated inside of a local scope (inside of a function) we need to use a local operator

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def main():
    temp = 'main local'
    def wrapper():
        local temp 
        # We used a local operator,
        # now we can impact the variable defined inside of main 
        temp = 'wrapper local'