python硒网络抓取“ NoSuchElementException”未能识别 [英] python selenium webscraping "NoSuchElementException" not recognized
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问题描述
有时我会在页面上寻找可能存在或可能不存在的元素。我想用 NoSuchElementException 尝试/捕获这种情况，当某些HTML元素不存在时，硒会抛出该异常。原始异常：
Sometimes on a page I'll be looking for an element which may or may not be there. I wanted to try/catch this case with a NoSuchElementException, which selenium was throwing when certain HTML elements didn't exist. Original exception:
NoSuchElementException: Message: u'Unable to locate element: {"method":"css selector","selector":"#one"}' ; Stacktrace:
at FirefoxDriver.prototype.findElementInternal_ (file:///var/folders/6q/7xcjtgyj32nfc2yp_y5tr9pm0000gn/T/tmp63Mz2a/extensions/fxdriver@googlecode.com/components/driver_component.js:8899)
at FirefoxDriver.prototype.findChildElement (file:///var/folders/6q/7xcjtgyj32nfc2yp_y5tr9pm0000gn/T/tmp63Mz2a/extensions/fxdriver@googlecode.com/components/driver_component.js:8911)
at DelayedCommand.prototype.executeInternal_/h (file:///var/folders/6q/7xcjtgyj32nfc2yp_y5tr9pm0000gn/T/tmp63Mz2a/extensions/fxdriver@googlecode.com/components/command_processor.js:10840)
at DelayedCommand.prototype.executeInternal_ (file:///var/folders/6q/7xcjtgyj32nfc2yp_y5tr9pm0000gn/T/tmp63Mz2a/extensions/fxdriver@googlecode.com/components/command_processor.js:10845)
at DelayedCommand.prototype.execute/< (file:///var/folders/6q/7xcjtgyj32nfc2yp_y5tr9pm0000gn/T/tmp63Mz2a/extensions/fxdriver@googlecode.com/components/command_processor.js:10787)
具有讽刺意味的是，它不会让我捕捉到它之前抛出的异常吗？代码在这里：
Ironically, it won't let me catch this exception which it was throwing before? Code here:
elt = driver.find_element_by_css_selector('.information')
try:
dat1 = elt.find_element_by_css_selector('#one').text
dat2 = elt.find_elements_by_css_selector('#two')[1].text
text = dat1 + dat2
except NoSuchElementException:
text = elt.find_element_by_css_selector('#all').text
item.set_description(text)
错误在这里：
NameError: name 'NoSuchElementException' is not defined
Google搜索/文档没有任何内容...而让我感到惊讶的是，硒可以抛出异常但不能捕获它。
Googling/documentation came up with nothing...and it strikes me as strange that selenium is fine throwing an exception but can't catch it.
推荐答案
您需要先导入异常
from selenium.common.exceptions import NoSuchElementException
然后您可以引用
except NoSuchElementException:
# handle the element not existing
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