[Solved] Python says a variable is undefined even though it’s clearly defined

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Well, the interpreter is not wrong. There is indeed no local variable named SIN_COUNTER, only a global one. You have to explicitly declare within the function’s context that the symbol SIN_COUNTER refers to a global object:

SIN_COUNTER = 0

def update():
    global SIN_COUNTER
    SIN_COUNTER += 8
    SIN_COUNTER = math.sin(SIN_COUNTER)

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solved Python says a variable is undefined even though it’s clearly defined