已知print_func.py的代码如下：
print('Hello
World!')
print('__name__
value: ', __name__)
def main():
print('This message is from main function')
if __name__ ==
'__main__':
main()
print_module.py的代码如下：
import print_func
print("Done!")
运行print_module.py程序，结果是：
Hello World! __name__ value: print_func Done!
Hello World! __name__ value: print_module Done!
Hello World! __name__ value: __main__ Done!
Hello World! __name__ value: Done!