如何使用 cmd 提示符检查我的设备上安装了多少个 Python 版本？

Question

I have Anaconda and Spyder, which I know use Python 3.6.5 and 3.6.6, alongside Python 3.7.0. How do I check how many version of python I have installed using the Windows Command Prompt?

Answer 1

The python launcher ( "C:\\WINDOWS\\py.exe" ) has a list command: py.exe -0 It displays all installed python versions. If all you want is a visual list, that works alone. In a batch script, however, you might want to count the versions:

setlocal enableDelayedExpansion
set pyvcount=0
for /f %%G in ('%SYSTEMROOT%\py.exe -0') do set /a pyvcount+=1

Unfortunately, the I cannot figure out how to stop the command from printing Installed Pythons found by py Launcher for Windows to the console.

EDIT:
Hide the output by redirecting error stream to nul

for /f %%G in ('%SYSTEMROOT%\py.exe -0 2>nul') do set /a pyvcount+=1