Testing selenium 2和python 3.4.1的问题

我有一个简单的自动填写登录表单字段。事实上，它通过良好的，但有问题。我需要在脚本填充字段后在控制台中查看实际输出，如“登录成功”或“未找到用户名”。我尝试了很多东西，但都没有用这种方式，我最后一次尝试是while循环，效果很好，但只有当我得到积极的结果时。我写了第二个条件，但当我键入错误的数据时，在控制台中看到所有这些错误会让我发疯。下面是代码和部分输出

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException

baseurl = "http://www.somesite/login"
email = input("Type an email: ")
password = input("Type a password: ")

xpaths = { 'loginBox' : "//input[@id='session_email']",
           'passwordBox' : "//input[@id='session_password']",
           'submitButton' :   "//input[@class='ufs-but']",
           'success' : "//div[@class='flash-message success']",
           'error' : "//span[@class='form_error']"
         }


mydriver = webdriver.Firefox()
mydriver.get(baseurl)


mydriver.find_element_by_xpath(xpaths['loginBox']).send_keys(email)


mydriver.find_element_by_xpath(xpaths['passwordBox']).send_keys(password)


mydriver.find_element_by_xpath(xpaths['submitButton']).click()


while mydriver.find_element_by_xpath(xpaths['success']):
    print("Success")
    if mydriver.find_element_by_xpath(xpaths['error']):
        print("No")

当我试图打断一个错误时，我得到了：

File "ab.py", line 32, in <module>
    while mydriver.find_element_by_xpath(xpaths['success']):
  File "/usr/local/lib/python3.4/site-packages/selenium-2.43.0-py3.4.egg/selenium/webdriver/remote/webdriver.py", line 230, in find_element_by_xpath
    return self.find_element(by=By.XPATH, value=xpath)
  File "/usr/local/lib/python3.4/site-packages/selenium-2.43.0-py3.4.egg/selenium/webdriver/remote/webdriver.py", line 662, in find_element
    {'using': by, 'value': value})['value']
  File "/usr/local/lib/python3.4/site-packages/selenium-2.43.0-py3.4.egg/selenium/webdriver/remote/webdriver.py", line 173, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.4/site-packages/selenium-2.43.0-py3.4.egg/selenium/webdriver/remote/errorhandler.py", line 166, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: 'Unable to locate element: {"method":"xpath","selector":"//div[@class=\'flash-message success\']"}' ; Stacktrace: 
    at FirefoxDriver.prototype.findElementInternal_ (file:///tmp/tmpjax8kj1u/extensions/fxdriver@googlecode.com/components/driver-component.js:9618:26)
    at FirefoxDriver.prototype.findElement (file:///tmp/tmpjax8kj1u/extensions/fxdriver@googlecode.com/components/driver-component.js:9627:3)
    at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpjax8kj1u/extensions/fxdriver@googlecode.com/components/command-processor.js:11612:16)
    at DelayedCommand.prototype.executeInternal_ (file:///tmp/tmpjax8kj1u/extensions/fxdriver@googlecode.com/components/command-processor.js:11617:7)
    at DelayedCommand.prototype.execute/< (file:///tmp/tmpjax8kj1u/extensions/fxdriver@googlecode.com/components/command-processor.js:11559:5) 

当我想要一个负的结果时，它可以工作，但不像我想要的那样：

Type an email: w
Type a password: wer
Success
No

正如你们所看到的，当结果是积极的时候，我想看到“成功”，当结果是消极的时候，我想看到“不”，但我不想同时看到它们

UPD。道具给我巨大的帮助，所以这就是我得到我想要的东西的原因：

try:
    success = True
    success_element = mydriver.find_element_by_xpath(xpaths['success'])
except NoSuchElementException:
    success = False
    print("Can't log in. Check email and/or password")
try:
    failure = True
    failure_element = mydriver.find_element_by_xpath(xpaths['error'])
except NoSuchElementException :
    failure = False
    print("Logged in successfully")

---

问题似乎在于您在最后构建while循环的方式。您不需要为了检查成功或失败而循环

假设您输入登录数据，则有四种结果。您可以找到决定成功的元素、决定失败的元素、两者都找到（应该不可能），或者两者都找不到（可能是在出现意外屏幕或加载页面失败的情况下）

不要期望webdriver查询返回一些值，而是尝试将它们放在

try

块中以捕获

NoTouchElementException

并检查非

None

内容。另外，请尝试处理这四种情况中的每一种，这样您的程序崩溃的频率就会降低

编辑：

试试这个

try:
    success = True
    success_element = mydriver.find_element_by_xpath(xpaths['success'])
except NoSuchElementException:
    success = False
try:
    failure = True
    failure_element = mydriver.find_element_by_xpath(xpaths['error'])
except NoSuchElementException :
    failure = False
# now handle the four possibilities

try:
    success = True
    success_element = mydriver.find_element_by_xpath(xpaths['success'])
except NoSuchElementException:
    success = False
try:
    failure = True
    failure_element = mydriver.find_element_by_xpath(xpaths['error'])
except NoSuchElementException :
    failure = False
# now handle the four possibilities