如何在 python selenium 中解决此错误我收到的错误消息是 TypeError: Object of type method is not JSON serializable

Question

I am getting this error when clicking on a submenu under a parent menu, please help me out to solve this problem, The error occurs when the script calls the 'Submenu method'

enter code here

This below class contain all the locators of the page

class workflow_locator:
    # Create a new workflow locator
    dropdown_xpath = "(//DIV[@class='btn-group dropdown'])[1]"
    admin_menu_xpath = "(//A[@class='dropdown-item'])[3]"
    breadcrumb_xpath = "(//DIV[@class='left-menu-toggle'])[1]"
    workflow_menu_xpath = "(//A[@_ngcontent-ng-cli-universal-c5=''])[31]"
    workflow_submenu_xpath = "(//A[@href='/admin/workflows'])"
    new_btn_xpath = "(//DIV[text()=' New'])"
    workflow_name_xpath = "(//INPUT[@id='name'])[1]"
    workflow_description_xpath = "(//TEXTAREA[@id='description'])[2]"
    active_toggle_xpath = "(//SPAN[@class='slider'])"
    add_button_xpath = "(//BUTTON[@class='btn btn-primary btn-sm'])[text()='Add']"


#This class define the action method of the below test class
from Resources.Workflow_locator import workflow_locator
class CreateWorkflow(workflow_locator):
    def __init__(self, driver):
        self.driver = driver

    def click_drop_down_menu(self):
        self.driver.find_element_by_xpath(self.dropdown_xpath).click()

    def select_admin_from_the_drop_down_menu(self):
        self.driver.find_element_by_xpath(self.admin_menu_xpath).click()

    def click_breadcrumb_menu(self):
        self.driver.find_element_by_xpath(self.breadcrumb_xpath).click()

    def click_workflow_menu(self):
        self.driver.find_element_by_xpath(self.workflow_menu_xpath).click()
    def click_workflow_sub_menu(self):
        self.driver.find_element_by_xpath(self.click_workflow_sub_menu).click()

# This is a test class
     def test_workflow(self, setup):
            self.driver = setup
            self.driver.get(self.base_url)
            self.driver.maximize_window()
            self.lp = Login(self.driver)
            self.lp.set_Username(self.username)
            self.lp.click_next_btn()
            self.lp.set_password(self.Password)
            self.lp.click_signin_btn()
            self.lp.click_confirm_btn()
            self.driver.get_screenshot_as_file(".\\Screenshoots\\login.png")
            self.logger.info("############ User is successfully logged in ########### ")
            print("Login is successfully completed")
            self.logger.info("######### Creating WorkFlow #########")
            self.wf=CreateWorkflow(self.driver)
            self.wf.click_drop_down_menu()
            self.wf.select_admin_from_the_drop_down_menu()
            self.wf.click_breadcrumb_menu()
            self.wf.click_workflow_menu()
            self.wf.click_workflow_sub_menu()

The exception I can see is

def default(self, o): """Implement this method in a subclass such that it returns a serializable object for o , or calls the base implementation (to raise a TypeError ).

    For example, to support arbitrary iterators, you could
    implement default like this::

        def default(self, o):
            try:
                iterable = iter(o)
            except TypeError:
                pass
            else:
                return list(iterable)
            # Let the base class default method raise the TypeError
            return JSONEncoder.default(self, o)

    """

 raise TypeError(f'Object of type {o.__class__.__name__} '

                    f'is not JSON serializable')

E TypeError: Object of type method is not JSON serializable

enter image description here

Answer 1

You have:

def click_workflow_menu(self):
    self.driver.find_element_by_xpath(self.workflow_menu_xpath).click()
def click_workflow_sub_menu(self):
    self.driver.find_element_by_xpath(self.click_workflow_sub_menu).click()

When you call self.click_workflow_sub_menu() , this is what happens:

1. self.click_workflow_sub_menu is evaluated. But this evaluates to a bound method and not a valid xpath expression.
2. self.driver.find_element_by_xpath is invoked with the result from step 1, which is not a valid xpath expression, and an exception results.

I believe that is your problem. What you probably meant was:

def click_workflow_sub_menu(self):
    self.driver.find_element_by_xpath(self.workflow_submenu_xpath).click()