Python 未定义全局变量 - 在内部声明 Class

Question

I've seen a lot of questions on global variables, but for some reason I still can't get mine to work.

Here is my scenario - I have my individual test cases and a separate python script that includes different functions for the various error messages you can get in the application I'm testing. If one of the validations fails, I want the function to increment a failure variable and then the main test script will check to see if it's a pass or fail.

class ErrorValidations:
    failures = 0
    def CheckforError1(driver):
        global failures
        try:
            if error1.is_displayed():
                failures += 1

    def CheckforError2(driver):
        global failures
        try:
            if error2.is_displayed():
                failures += 1

    def CheckforError3(driver):
        global failures
        try:
            if error3.is_displayed():
                failures += 1

This is a heavily edited example of where the validations get used:

from functionslist import ErrorValidations


def test(driver, browser, test_state):

    _modules = driver.find_elements_by_xpath('//div[@class="navlink"]')

    for i in _modules:
        i.click()

        ErrorValidations.CheckforError1(driver)
        ErrorValidations.CheckforError2(driver)
        ErrorValidations.CheckforError3(driver)

        if ErrorValidations.failures > 0:
            driver.report.AppendToReport( i.text, "The " + i.text + "page was not able to load without errors.", "fail", "")
        else:
            driver.report.AppendToReport( i.text,  "The " + i.text + "page was able to load without errors.", "pass", "")

The test is not properly incrementing the failures variable and I get the error: name 'failures' is not defined, but I'm not sure where else to define it.

Answer 1

You're declaring a class attribute 'failures', not a global, within the ErrorValidations

Instead of using global failures try:

class ErrorValidations:
    failures = 0

    def CheckforError1(driver):
        try:
            if error1.is_displayed():
                ErrorValidations.failures += 1

A true global would be declared outside of the class