安装某些包的必要依赖，如报错：
Processing c:\users\u6072479\downloads\matplotlib-3.1.2-cp36-cp36m-win_amd64.whl
Requirement already satisfied: python-dateutil>=2.1 in c:\users\u6072479\appdata\local\programs\python\python36\lib\site-packages (from matplotlib==3.1.2) (2.8.0)
Collecting cycler>=0.10
Downloading https://files.pythonhosted.org/packages/f7/d2/e07d3ebb2bd7af696440ce7e754c59dd546ffe1bbe732c8ab68b9c834e61/cycler-0.10.0-py2.py3-none-any.whl
Collecting pyparsing!=2.0.4,!=2.1.2,!=2.1.6,>=2.0.1
ERROR: Could not install packages due to an EnvironmentError: [WinError 87] The parameter is incorrect
