程序中的executecommand函数接受输入mydoc并打印输入。
当程序运行时,它正是这样做的。以下给定示例中的输入hello被视为函数executecommand的输入。此函数打印 hello 并返回到调用程序main,然后由于没有更多语句而终止。

>>> def executeCommand(myDoc): 
...     print(myDoc)
...     return 
... 
>>> def insert():
...     print("insert command:")
...     return
... 
>>> def delete():
...     print("delete command:")
...     return
... 
>>> def main():
...     print("Functional Text Editor ")
...     executeCommand(input("Type in file name: "))
... 
>>> if __name__ == '__main__':
...     main()
... 
Functional Text Editor 
Type in file name: hello
hello
>>>