我在Python中导入自定义模块时发生导入错误

Question

我在package（页面，基础）和测试目录中创建了一些自定义模块，而我从页面和基础中导入模块的测试模块也很少。

页面包中的模块：

pom_login_page.py -->it has PM_Login_Page class
pom_pm_homepage.py --> it has PM_HomePage class
pom_pm_userpage.py --_ it has PM_UserPage class

modules in base package:
selenium_driver.py --> it has Selenium_Driver class
webdriver_factory.py --> it has WebdriverFactory class

Below are import statements in test_pm_login_tests.py file present in tests package.

：     导入单元测试     导入pytest     从Utility.delete_user_data导入Delete_User_Data     导入日志     从pages.pom_pm_user_page导入PM_Users_Page     从pages.pom_login_page导入PmLoginPage

当我尝试执行test_pm_login_tests.py时，出现以下错误：

_______________________________________________ ERROR collecting test_pm_login_tests.py ________________________________________________
ImportError while importing test module 'C:\Users\mallikar\Documents\Python_Workspace\PM_SNM_Automation\tests\test_pm_login_tests.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
test_pm_login_tests.py:1: in <module>
    from pages.pom_login_page import PmLoginPage
..\pages\pom_login_page.py:1: in <module>
    from base.selenium_driver import SeleniumDriver
..\base\selenium_driver.py:7: in <module>
    from utilities.util import Util
..\utilities\util.py:5: in <module>
    from snm_pages.pom_snm_loginpage import SNM_Login_Page
..\snm_pages\pom_snm_loginpage.py:1: in <module>
    from base.selenium_driver import SeleniumDriver
E   ImportError: cannot import name 'SeleniumDriver' from 'base.selenium_driver' (C:\Users\mallikar\Documents\Python_Workspace\PM_SNM_Aut
omation\base\selenium_driver.py)

几天来运行良好，但今天我面临这些问题。

任何对此的帮助都会对我有很大帮助。