1.urllib2在python3中已经没了，使用urllib3 相应代码也要做更改
原代码 :
response = urllib2.urlopen(url)
data = response.read()
改为
http = urllib3.PoolManager()
response = http.request('GET', url)
data = response.data
2.try except python3中有更改
except Exception as e：#多了个as
3. gevent访问https时报错;
MonkeyPatchWarning: Monkey-patching ssl after ssl has already been imported may lead to errors, including RecursionError on Python 3.6. It may also silently lead to incorrect behaviour on Python 3.7. Please monkey-patch earlier. See https://github.com/gevent/gevent/issues/1016. Modules that had direct imports (NOT patched): ['urllib3.util (D:\project\venv\lib\site-packages\urllib3\util\__init__.py)', 'urllib3.util.ssl_ (D:\project\venv\lib\site-packages\urllib3\util\ssl_.py)'].
monkey.patch_all()
上述链接已经说明解决方法就是 monkey.patch_all()需要在import urllib3前完成。但是这样又不符合PEP8的规范。目前还不知道有什么更完美的方法