if __name__ == "__main__":

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文件名:const.pyPI = 3.14def main():    return PIif __name__ == "__main__":    print("PI:", main())结果:PI: 3.14文件名:area.pyfrom const import PIdef calc_round_area(radius):    return PI * (radius ** 2)print("round area: ", calc_round_area(2))结果:round area:  12.56文件名:const.pyPI = 3.14def main():    return PIprint("PI:", main())文件名:area.pyfrom const import PIdef calc_round_area(radius):    return PI * (radius ** 2)print("round area: ", calc_round_area(2))结果:PI: 3.14     round area:  12.56