转自网络，备忘。对我有用的就一行代码：

ssl._create_default_https_context = ssl._create_unverified_context

这最近人工智能比较火，看了一下大多都是python的代码，最近看看python 的代码，一出来就遇到了坑,空格的问题先不说了直接上代码吧

python python3 log_python.py

Traceback (most recent call last):

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 1318, in do_open

encode_chunked=req.has_header(‘Transfer-encoding’))

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 1239, in request

self._send_request(method, url, body, headers, encode_chunked)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 1285, in _send_request

self.endheaders(body, encode_chunked=encode_chunked)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 1234, in endheaders

self._send_output(message_body, encode_chunked=encode_chunked)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 1026, in _send_output

self.send(msg)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 964, in send

self.connect()

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py”, line 1400, in connect

server_hostname=server_hostname)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py”, line 401, in wrap_socket

_context=self, _session=session)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py”, line 808, in __init__

self.do_handshake()

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py”, line 1061, in do_handshake

self._sslobj.do_handshake()

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py”, line 683, in do_handshake

self._sslobj.do_handshake()

ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File “log_python.py”, line 6, in

response = urllib.request.urlopen(‘https://www.douban.com/’)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 223, in urlopen

return opener.open(url, data, timeout)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 526, in open

response = self._open(req, data)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 544, in _open

‘_open’, req)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 504, in _call_chain

result = func(*args)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 1361, in https_open

context=self._context, check_hostname=self._check_hostname)

File “/usr/local/homebrew/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py”, line 1320, in do_open

raise URLError(err)

urllib.error.URLError:

出了一堆的错，然后在 http://stackoverflow.com/questions/27835619/ssl-certificate-verify-failed-error 找到了答案:

要引入 一个ssl 的模块，然后，就没有然后了

Could not fetch URL https://pypi.python.org/simple/nltk/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED]

certificate verify failed (_ssl.c:749) - skipping

Could not find a version that satisfies the requirement nltk (from versions: )

No matching distribution found for nltk

报了上面的错，下面的语句解决.

pip –trusted-host pypi.python.org install

报了上面的错，下面的语句解决

pip3 install certifi