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我们在安装Python3(>=3.3)时,Python的安装包实际上在系统中安装了一个启动器py.exe,默认放置在文件夹C:\Windows\下面 | |
py -2 hello.py | |
py -3 hello.py | |
py.exe这个启动器允许你在代码中加入说明 | |
#! python2 | |
#! python3 | |
使用 | |
py hello.py | |
要使用启动器py.exe来指定pip的版本 | |
py -2 -m pip install XXXX | |
py -3 -m pip install XXXX | |
py -2 -m pip -V | |
py -2 -m pip install pip --upgrade | |
Python2要在代码文件顶部增加一行说明,才能够在代码中使用中文。 | |
#! python2 需要放在第一行,编码说明可以放在第二行。 | |
#! python2 | |
# coding: utf-8 |
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用virtualenv配置python的虚拟环境,其实就是将某个特定项目(或者说目录下)配置成某个python版本 | |
pip install virtualenv | |
virtualenv -p c:\Python\Python37-32\python.exe HigEnv | |
virtualenv -p c:\Python\Python27\python.exe HigEnv | |
cd HigEnv\Scripts | |
activate | |
deactivate |
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