为什么pip不能在虚拟环境中工作？

Question

我正在尝试在Linux-ubuntu14.04x64上使用虚拟环境中的pip。你知道吗

使用shell中的pip作为：

pip search bla

很好用。你知道吗

但使用virtualenv显示错误：

(proj_testing)uxu@box:~$ pip search bla
/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
Exception:
Traceback (most recent call last):
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/commands/search.py", line 43, in run
    pypi_hits = self.search(query, options)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/commands/search.py", line 60, in search
    hits = pypi.search({'name': query, 'summary': query}, 'or')
  File "/usr/lib/python2.7/xmlrpclib.py", line 1233, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1587, in __request
    verbose=self.__verbose
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/download.py", line 785, in request
    headers=headers, stream=True)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 508, in post
    return self.request('POST', url, data=data, json=json, **kwargs)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/download.py", line 373, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 465, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 573, in send
    r = adapter.send(request, **kwargs)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/adapter.py", line 46, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "/home/uxu/.virtualenvs/proj_testing/local/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 431, in send
    raise SSLError(e, request=request)
SSLError: [Errno 1] _ssl.c:510: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

没道理，有人知道吗？你知道吗

Answer 1

从https://urllib3.readthedocs.org/en/latest/security.html：

Certain Python platforms (specifically, versions of Python earlier than 2.7.9) have restrictions in their ssl module that limit the configuration that urllib3 can apply. In particular, this can cause HTTPS requests that would succeed on more featureful platforms to fail, and can cause certain security features to be unavailable. If you encounter this warning, it is strongly recommended you upgrade to a newer Python version, or that you use pyOpenSSL as described in the OpenSSL / PyOpenSSL section.

您的虚拟环境中可能有一个较新版本的python。也许这就是为什么这个错误只发生在虚拟环境中。你知道吗

Answer 2

尝试执行pip search bla像superuser

对于ubuntu，命令是：

sudo pip search bla