fig04_03.py

# fig04_03.py
"""Function-call stack demonstration script."""

def main():
    result = square(7)  # square's stack frame pushed onto stack here
    print('square(7):', result)  
    # main's stack frame is popped here

def square(number):
    return number ** 2  # square's stack frame is popped here

main()  # execution begins here
# when main returns, the script terminates here

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