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reference_mystery2

Language/Type: Python parameters reference semantics

When the main function below is called, the following code produces 4 lines of output. Write each line of output below as it would appear on the console. 

def mystery(x, a):
    x = x * 2
    if x > 6:
        a[2] = 14
        a[1] = 9
    else:
        a[0] = 9
        a[3] = 14
    print(x, a)

def main():
    x = 1
    a = [0] * 4

    x = x * 2
    mystery(x, a)
    print(x, a)

    x = x * 2
    mystery(x, a)
    print(x, a)

main()
line 1
line 2
line 3
line 4

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