CODEWITHSUNDEEP
pythonfunctionvariables
RandomPhobia
RandomPhobia

Reputation: 4802

Python: Variables aren't re-assigned

Why aren't the variables below (A,B,C,D) changed when tst is called.

A,B,C = 0,0,0
D = 0

def tst():
    A,B,C = 1,2,3
    D = 4
    print(A,B,C,D)

tst() # tst is called
print(A,B,C,D)

Output:

(1, 2, 3, 4)
(0, 0, 0, 0)

Upvotes: 1

Views: 109

Answers (2)

Mike Corcoran
Mike Corcoran

Reputation: 14565

because of Python scoping rules.

in def tst(), you're creating local variables A, B, and C, and assigning them new values.

if you wish to assign to the global A,B, and C values, use the global keyword.

Upvotes: 6

Junuxx
Junuxx

Reputation: 14261

The variables within the tst method are local, that is, they refer to different values that only exist inside scope of that method. Use the keyword global (as in global A,B,C,D) inside tst to fix the behavior. See an example here and the question here.

Upvotes: 1

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