将变量传递到xpath selenium、Python

这是我试图将变量传递到xpath的代码

def findcase(year):     
    select = Select(driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear'))
    select.select_by_value(str(year))

正在获取以下错误消息：

Traceback (most recent call last):
  File "/Users/jackboland/Library/Mobile Documents/com~apple~CloudDocs/Python/Selenium/8thDistBriefScraping_FUNCTIONVersion.py", line 27, in <module>
    findcase('2013','100604')
  File "/Users/jackboland/Library/Mobile Documents/com~apple~CloudDocs/Python/Selenium/8thDistBriefScraping_FUNCTIONVersion.py", line 18, in findcase
    select = Select(driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear'))
  File "/anaconda2/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 353, in find_element_by_id
    return self.find_element(by=By.ID, value=id_)
  File "/anaconda2/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 957, in find_element
    'value': value})['value']
  File "/anaconda2/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 314, in execute
    self.error_handler.check_response(response)
  File "/anaconda2/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear"}
  (Session info: chrome=66.0.3359.181)
  (Driver info: chromedriver=2.38.552518 (183d19265345f54ce39cbb94cf81ba5f15905011),platform=Mac OS X 10.13.4 x86_64)

---

我明白了。有效的代码如下所示：

year = 2014
yearstr = str(year)
casenum = 100604
casenumstr = str(casenum)
select = Select(driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear'))
select.select_by_value(yearstr)
#inserts the case number in that box below the year
driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_txtCaseNum').send_keys(casenumstr)

---

错误表示找不到id为

SheetContentPlaceHolder\u coaCaseSearch\u ddlCaseYear

的元素，请手动检查Chrome DevTool中的定位器

#SheetContentPlaceHolder_CoaceSearch_DlcaseYear

，并在您的问题中共享相关HTML能否共享HTML您的问题与将变量传递到XPath无关，因为：1）您没有使用XPath，2）在

选择之前的行中出现异常。按值选择（str（年）

。确保

select

节点不是动态生成的，它不位于

iframe

内。我认为下面是相关的HTML。注意，如果我只是在上面的代码中输入一年，而不是我所做的变量尝试，我不会收到任何错误。因此，selenium代码与实际值完美配合，如上所述，尝试将变量名传递到代码中失败。[link]#SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear[link]

year = 2014
yearstr = str(year)
casenum = 100604
casenumstr = str(casenum)
select = Select(driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_ddlCaseYear'))
select.select_by_value(yearstr)
#inserts the case number in that box below the year
driver.find_element_by_id('SheetContentPlaceHolder_coaCaseSearch_txtCaseNum').send_keys(casenumstr)