如何避免get_attribute 获取null
时间: 2024-03-22 17:40:24 浏览: 23
要避免get_attribute获取null(即空值),可以在使用get_attribute方法之前,先使用is_displayed()方法判断元素是否存在,如果存在再使用get_attribute方法获取元素属性。另外,也可以使用try-except语句来捕获可能出现的异常,以防止程序崩溃。以下是一个示例代码:
```
try:
element = driver.find_element_by_xpath('xpath')
if element.is_displayed():
attribute_value = element.get_attribute('attribute_name')
except Exception as e:
print(e)
```
相关问题
element.get_attribute("xpath")
Apologies for the confusion, but the `get_attribute()` method in Selenium does not directly retrieve the XPath of an element. It is used to retrieve the value of a specific attribute of an element.
To obtain the XPath of an element using Selenium in Python, you can make use of the `selenium.webdriver.common.by.By` class and the `find_element()` method. Here's an example:
```python
from selenium import webdriver
from selenium.webdriver.common.by import By
driver = webdriver.Firefox()
driver.get("https://www.example.com")
element = driver.find_element(By.XPATH, "//div[@id='myElement']")
xpath = driver.execute_script("function absoluteXPath(element) {\
var comp, comps = [];\
var parent = null;\
var xpath = '';\
var getPos = function(element) {\
var position = 1, curNode;\
if (element.nodeType == Node.ATTRIBUTE_NODE) {\
return null;\
}\
for (curNode = element.previousSibling; curNode; curNode = curNode.previousSibling) {\
if (curNode.nodeName == element.nodeName) {\
++position;\
}\
}\
return position;\
};\
if (element instanceof Document) {\
return '/';\
}\
for (; element && !(element instanceof Document); element = element.nodeType == Node.ATTRIBUTE_NODE ? element.ownerElement : element.parentNode) {\
comp = comps[comps.length] = {};\
switch (element.nodeType) {\
case Node.TEXT_NODE:\
comp.name = 'text()';\
break;\
case Node.ATTRIBUTE_NODE:\
comp.name = '@' + element.nodeName;\
break;\
case Node.PROCESSING_INSTRUCTION_NODE:\
comp.name = 'processing-instruction()';\
break;\
case Node.COMMENT_NODE:\
comp.name = 'comment()';\
break;\
case Node.ELEMENT_NODE:\
comp.name = element.nodeName;\
break;\
}\
comp.position = getPos(element);\
}\
for (var i = comps.length - 1; i >= 0; i--) {\
comp = comps[i];\
xpath += '/' + comp.name.toLowerCase();\
if (comp.position !== null) {\
xpath += '[' + comp.position + ']';\
}\
}\
return xpath;\
}\
return absoluteXPath(arguments[0]);", element)
print(xpath)
driver.quit()
```
In the above example, we first import the required modules and create a new instance of the Firefox driver. Then, we navigate to the desired webpage.
Next, we use `find_element()` by passing `By.XPATH` as the locator strategy and an XPath expression as a parameter. In this example, we use the XPath `//div[@id='myElement']` to find the element with the ID "myElement".
After that, we execute a JavaScript function using `driver.execute_script()` to calculate the absolute XPath of the element. The JavaScript function iterates through the element's ancestors and constructs the XPath by considering the node name and position.
Finally, we print out the obtained XPath and close the browser using `driver.quit()`.
Please note that this example uses a JavaScript function to calculate the absolute XPath. It may not be the most efficient method, but it can be helpful in certain scenarios.
'dict' object has no attribute 'get_name'
这个错误是因为你使用的对象是一个字典('dict' object),而字典对象没有名为'get_name'的属性。要解决这个问题,你需要使用正确的对象和属性。
提到的引用内容中,都是关于一个不同的错误,即'TfidfVectorizer'对象没有属性'get_feature_names_out'。这是因为在该版本的scikit-learn库中,'TfidfVectorizer'对象的属性名称发生了变化。正确的属性名称应该是'get_feature_names',而不是'get_feature_names_out'。
因此,你需要将代码中的'get_feature_names_out'更正为'get_feature_names',以解决这个错误。这样,你就可以正确地获取'TfidfVectorizer'对象的特征名称了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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