Python NameError: 名称 'urllib2' 未定义
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NameError: name 'urllib2' is not defined
提问by user3073498
I am currently building a webscrapper and I need to catch url exceptions. My code sample is the one below.
我目前正在构建一个 webscrapper，我需要捕获 url 异常。我的代码示例如下。
from urllib2 import urlopen
Try:
//some code
Except urllib2.HTTPError:
pass
回答by Martijn Pieters
You only imported the name urlopen, not the urllib2module itself.
您只导入了 name urlopen，而不是urllib2模块本身。
Import the exception too and refer to it directly:
也导入异常，直接引用：
from urllib2 import urlopen, HTTPError
try:
# ...
except HTTPError:
pass
Alternatively, import just the module, but then also use urllib2.urlopen():
或者，只导入模块，然后也使用urllib2.urlopen()：
import urllib2
try:
# ...
response = urllib2.urlopen(...)
# ...
except urllib2.HTTPError:
pass
