问题1
我们在安装Python2和Python3时，配置好环境变量后，运行Python3的pip时，出问题
pip3 install requests结果为
Fatal error in launcher:Unable to create process using ' " '
解决方法为
python3 -m pip install requests
问题2
有时候我们需要离线进行python包的安装，安装的方式通常用有1.运行exe文件，或者到解压缩zip/tar文件，到目录下，运行python setup.py install,但是往往因为各种安装环境的问题，使得安装失败，比如
RuntimeError:Broken Toolchain: cannot link s simple C program
Unable to find vcvarsall.bat
等等
有一个非常快捷的解决方案，就是安装wheel文件，
python3 -m pip install 某个包.whl
什么是wheel文件
Wheels are the new standard of python distribution and are intended to replace eggs. Support is offered in pip >= 1.4 and setuptools >= 0.8.
他的优势如下
- Faster installation for pure python and native C extension packages.
- Avoids arbitrary code execution for installation. (Avoids setup.py)
- Installation of a C extension does not require a compiler on Windows or macOS
(待续)