  提示这个:
DEPRECATION: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of pip will drop support for Python 2.6
Collecting pyOpenSSL
/usr/lib/python2.6/site-packages/pip/_vendor/urllib3/util/ssl_.py:339: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/e ... e.html#ssl-warnings
SNIMissingWarning
/usr/lib/python2.6/site-packages/pip/_vendor/urllib3/util/ssl_.py:137: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/e ... e.html#ssl-warnings
InsecurePlatformWarning
Downloading https://pypi.doubanio.com/packag ... y2.py3-none-any.whl (53kB)
100% |████████████████████████████████| 61kB 7.5MB/s
Collecting cryptography>=2.2.1 (from pyOpenSSL)
Downloading https://pypi.doubanio.com/packag ... tography-2.3.tar.gz (449kB)
100% |████████████████████████████████| 450kB 15.2MB/s
cryptography requires Python '>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*' but the running Python is 2.6.6
You are using pip version 9.0.3, however version 18.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
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