请问一下 selenium 报错：selenium.common.exceptions.InvalidArgumentException: Message: invalid argument: 'value' must be a string 该怎么解决

Jerry li 9
2022-07-25 14:37:16 未知地区 1F
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没看到你详细的代码，不过看打印的信息，你的 xpath 值，里面单双引号混用了刚刚改了一下，又出现了这种问题，send_keys 中 value 的值就是字符串
do_cf = ParseConFile()
URL = do_cf.get_locators_or_account(‘TESTURL’, ‘URL’)
username = do_cf.get_locators_or_account(‘LoginAccountElements’, ‘username’)
password = do_cf.get_locators_or_account(‘LoginAccountElements’, ‘password’)
verification = do_cf.get_locators_or_account(‘LoginAccountElements’, ‘Verification’)
login = do_cf.get_locators_or_account(‘LoginAccountElements’, ‘Login’)

print(type(username))
print(username)
print(type(password))
print(password)
print(type(verification))
print(verification)
print(type(login))
print(login)

def login_busin(user, passwd):
img_name = “../img/scr.png”
br = WebKey(txt=”gg”)
# try:
br.open_url(URL)
br.sleep(tm=1)
br.__find_element__(lc=’xpath’, locator=username).send_keys(user)
br.__find_element__(lc=’xpath’, locator=password, ).send_keys(value=passwd)
read_image.screenshot(img_name)
text = read_image.ocr(img_name)
br.__find_element__(lc=’xpath’, locator=verification).send_keys(value=text)
br.click(lc=’xpath’, locator=login)
br.sleep(tm=1)
br.sleep(10)
br.close()

login_busin(user=’ctz’, passwd=’admin123456?’)

打印出来的是
<class ‘tuple’>
(‘xpath’, ‘//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入帐户名’]’)
<class ‘tuple’>
(‘xpath’, ‘//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入密码’]’)
<class ‘tuple’>
(‘xpath’, ‘//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入验证码’]’)
<class ‘tuple’>
(‘xpath’, “//button[@class=’login_btn’]”)
Traceback (most recent call last):
File “D:/dingdang_project/DD_changtu/libs/login_business.py”, line 44, in <module>
login_busin(user=’ctz’, passwd=’admin123456?’)
File “D:/dingdang_project/DD_changtu/libs/login_business.py”, line 30, in login_busin
br.__find_element__(lc=’xpath’, locator=username).send_keys(user)
AttributeError: ‘tuple’ object has no attribute ‘send_keys’
1、从两次的堆栈看，都不是执行 sendKeys 报的错（），而是 br.__find_element__。你一直去看 send_keys 方向不对。

2、你提供的代码里没有 __find_element__ 的完整实现，无法继续追查定位。如果需要进一步协助，麻烦把这部分源码以及涉及的其他相关函数源码也一并附上来吧。

PS：从你贴上来的代码里，username 这个传给 __find_element__ 的 locator 的值类型是 tuple 而非 string ，而从错误堆栈看这个 locator 是直接传给 self.driver.findElement(By.XPATH, locator) 的。正常 self.driver.findElement(By.XPATH, locator) 这里面的 locator 应该是 string 类型的，值内容就是 xpath 的具体定位路径，你也可以从这个角度去排查下。这个把定位的方法写在一块了
def __find_element__(self, lc, locator):
“””元素定位”””
if lc == “id”:
ele = self.driver.find_element(By.ID, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “name”:
ele = self.driver.find_element(By.NAME, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “xpath”:
ele = (By.XPATH, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “tag_name”:
ele = self.driver.find_element(By.TAG_NAME, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “link_text”:
ele = self.driver.find_element(By.LINK_TEXT, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “partial_link_text”:
ele = self.driver.find_element(By.PARTIAL_LINK_TEXT, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “css_selector”:
ele = self.driver.find_element(By.CSS_SELECTOR, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
elif lc == “class_name”:
ele = self.driver.find_element(By.CLASS_NAME, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
else:
ele = self.driver.find_element(By.XPATH, locator)
wdw(self.driver, 10).until(ec.visibility_of_element_located(ele))
return ele

def send_key(self, lc, locator, value):
“””
找到元素，并完成输入
:param lc: 定位器，默认xpath定位
:param locator:
:param value:需要输入的字符串
:return:
“””
send = self.__find_element__(lc, locator)
send.send_keys(value)
账号
username = xpath->//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入帐户名’]
密码
password = xpath->//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入密码’]
验证码图片
Verification_Code = xpath->//*[@class = “user-layout-login ant-form ant-form-horizontal”]/div[3]/div[2]/img
验证码输入框
Verification = xpath->//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入验证码’]
登录按钮
Login = xpath->//button[@class=’login_btn’]
def get_locators_or_account(self, section, option):
“””获取指定section, 指定option对应的数据, 返回元祖和字符串”””
try:
locator = self.conf.get(section, option)
if (‘->’ in locator):
locator = tuple(locator.split(‘->’))
return locator[1]
except configparser.NoOptionError as e:
print(‘error:’, e)
return ‘error: No option “{}” in section: “{}”‘.format(option, section)

使用这个方法获取这个 xpath 地址信息，查了一下 type，也是 str 类型

有点奇怪，你上面贴的打印日志里，get_locators_or_account 返回的值类型是 tuple 哦？你看下是不是你那时候的代码有问题导致返回的是 tuple 类型？就是 str 也会报这个错误
<class ‘str’>
//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入帐户名’]
<class ‘str’>
//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入密码’]
<class ‘str’>
//span[@class = “ant-input-affix-wrapper ant-input-affix-wrapper-lg”]/input[@placeholder=’请输入验证码’]
<class ‘str’>
//button[@class=’login_btn’]
Traceback (most recent call last):
File “D:/dingdang_project/DD_changtu/libs/login_business.py”, line 45, in <module>
login_busin(user=’ctz’, passwd=’admin123456?’)
File “D:/dingdang_project/DD_changtu/libs/login_business.py”, line 31, in login_busin
br.__find_element__(lc=’xpath’, locator=username).send_keys(user)
AttributeError: ‘tuple’ object has no attribute ‘send_keys’

Process finished with exit code 1
现在就是不知道这个 tuple 格式数据哪里来的，找不到这个数据
是不是在这里？elif lc == “xpath”:
ele = (By.XPATH, locator)

是不是这里写错了啊，没有 find_element那个补充之后，运行又提示 find_element() argument after * must be an iterable, not WebElement 加油，Seldom，你值得拥有！又运行了一下，莫名其妙的好了 ，谢谢各位的帮忙了 debug 看一下就知道了。。

题外话：find_element 是不是可以优化下
1.wdw(self.driver, 10).until(ec.visibility_of_element_located(ele)) 可以提出来，而不是重复地放在每个 case 里面，
2.等待的时间，是不是可以设置个默认参数接受传入， 而不是写死好的，我修改一下，谢谢