virtualenv

安装

pip install virtualenv

python3 virtualenv创建虚拟环境错误：

C:\fjcqy\_computer\Programming\Python\PythonLibrary\virtualenv>"C:\Python36\Scripts\virtualenv.exe" --no-download virtualenv_test3
Using base prefix 'c:\\python36'
New python executable in C:\fjcqy\_computer\Programming\Python\PythonLibrary\virtualenv\virtualenv_test3\Scripts\python.exe
Installing setuptools, pip, wheel...
done.
Traceback (most recent call last):
  File "c:\python36\lib\site-packages\virtualenv.py", line 938, in call_subprocess
    line = line.decode(encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb3 in position 38: invalid start byte

这种错误经常发生在window用户电脑上。根本原因: 编码问题，打开："Python36\Lib\site-packages\virtualenv.py"

定位到报错的那行代码：

line = line.decode(encoding)

然后在decode函数里面添加igonre, 如下：

line = line.decode(encoding,"ignore")

然后再创建，就没有报错了。

创建虚拟环境

virtualenv --no-download virtualenv_test
cd virtualenv_test\Scripts
activate

# Python2
"C:\Python27\Scripts\virtualenv.exe" --no-download virtualenv_py2
cd virtualenv_py2\Scripts
activate

# Python3
"C:\Python36\Scripts\virtualenv.exe" --no-download virtualenv_py3
cd virtualenv_py3\Scripts
activate

注：默认情况下虚拟环境不会依赖系统环境的site-packages，如果想依赖系统环境的site-packages，可以使用--system-site-packages来设置。

virtualenv --system-site-packages cms