Windows switch between python 2 and 3

[Zachary Ware]

On Thu, Oct 27, 2016 at 10:11 AM, Daiyue Weng <daiyueweng at gmail.com> wrote:
> Hi, I installed Python 2.7 and Python 3.5 64 bit versions on Win 10. Under
>
> C:\Python35
>
> C:\Python27
>
> Both have been set in environment variable Path.
>
> When I type python in cmd, it only gives me python 2.7, I am wondering how
> to switch between 2 and 3 in command prompt.

Along with Python 3.5, the Python Launcher for Windows (py.exe) was
installed in C:\Windows, unless you unchecked it.  You can choose
which interpreter you want to run by an argument to py.exe; for Python
2.7, use `py -2.7`; for Python 3.5, use `py -3.5`.  There are also
shortcuts for "latest Python 2" and "latest Python 3", `py -2` and `py
-3` respectively.  Calling `py` on its own will default to matching
`py -2`, but settings can be changed in C:\Windows\py.ini.  See
https://docs.python.org/using/windows.html#launcher for more details.

-- 
Zach