我有两个.py文件。主模块是'TS_File_analysis.py'，子模块是'Port_operations. py'。
导入主模块中的子模块。

from Port_operations import *

def main_menu():
    try:
        if r == 1:
            print()
        elif r == 2:
            search_cmd_output()
        elif r == 3:
            port_analyze_drops()
        elif r == 4:
            print('Exit out.! Good bye..:)')
            return
        else:
            print('Entered option was not valid.\n')
            main_menu()
    except ValueError as ex:
        print('Din\'t choose any option.\n')
        main_menu()

在子模块文件中导入main_module。

from TS_File_analysis import main_menu

def port_analyze_drops():
    try:
        if int(r2) == 1:
            get_output_of_port_drops()  
        elif int(r2) == 2:
            get_output_of_port_errors()
        elif int(r2) == 3:
            del_res_file(temp_result2)
            main_menu()
        else:
            print('Entered option was not valid.\n')
            port_analyze_drops()
    except ValueError as ex:
        print('Din\'t choose any option.\n')
        port_analyze_drops()
    return

在初始运行时，我们可以成功地从main_module转到sub_module，然后返回main_module。同样，如果我想从main_module转到sub_module，它会失败，并显示以下跟踪。

Traceback (most recent call last):
  File "C:\Users\user1\Documents\Python\Source\Workspace\TS_File_Analysis\TS_File_analysis.py", line 151, in <module>
    main_menu()
  File "C:\Users\user1\Documents\Python\Source\Workspace\TS_File_Analysis\TS_File_analysis.py", line 95, in main_menu
    port_analyze_drops()
  File "C:\Users\user1\Documents\Python\Source\Workspace\TS_File_Analysis\Port_operations.py", line 20, in port_analyze_drops
    main_menu()
  File "C:\Users\user1\Documents\Python\Source\Workspace\TS_File_Analysis\TS_File_analysis.py", line 94, in main_menu
    port_analyze_drops.__module__
NameError: name 'port_analyze_drops' is not defined

期望从main_module切换到sub_module，反之亦然，次数与您尝试切换的次数相同。