Python2 and Python3 coexist under windows

I believe many of my friends have been searching the internet for Python multi-version coexistence issues.

Many of the statements are modified Python.exe's name is Python2.exe or Python3.exe.

But I don't always succeed in this way.

After modifying the name of the Python.exe, run Pip is always reported Fatal error in the launcher:unable to create process using ' "'.

In fact, you do not have to modify the original Python.exe name, only need to copy a Python.exe file, modify the name of Python2.exe or Python3.exe on it.

When we installed Python3 (>=3.3), the Python installation package actually installed a launcher Py.exe in the system,

The default placement is under Folder C:\Windows\, which can be used when running Python files

Py-3 hello.py or Py-2 hello.py

It is still troublesome to add the parameter -2/-3 each run, so py.exe this launcher allows you to add a description to the code,

Indicates whether this file should be run by python2 or interpreted by Python3. The way to do this is to add a line at the beginning of the code file

#! Python2

Or

#! Python3

PY hello.py

When using PIP to install the module, you can use

Py-3 pipinstall xxxx or py-2 pipinstall xxxx

Python2 and Python3 coexist under windows