Bad md5 hash for package

[root@master conn]# pip install chardet==2.2.1
Collecting chardet==2.2.1
/usr/lib/python2.6/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:79: 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
  Downloading chardet-2.2.1-py2.py3-none-any.whl (180kB)
    72% |███████████████████████▎        | 131kB 357bytes/s eta 0:02:19
  Hash of the package https://pypi.python.org/packages/2.7/c/chardet/chardet-2.2.1-py2.py3-none-any.whl#md5=556de73cc5d2d14233b3512798423da1 (from https://pypi.python.org/simple/chardet/) (be001cd2dbe90bb1f1dd4ab4b008c169) doesn't match the expected hash 556de73cc5d2d14233b3512798423da1!

  Bad md5 hash for package https://pypi.python.org/packages/2.7/c/chardet/chardet-2.2.1-py2.py3-none-any.whl#md5=556de73cc5d2d14233b3512798423da1 (from https://pypi.python.org/simple/chardet/)

解決方案：

wget https://pypi.python.org/packages/2.7/c/chardet/chardet-2.2.1-py2.py3-none-any.whl --no-check-certificate

md5sum chardet-2.2.1-py2.py3-none-any.whl

pip install chardet-2.2.1-py2.py3-none-any.whl