如何检查 Windows 上所有已安装的 Python 版本？

Question

Please note I'm not asking "how to check which version of Python did I install".

I've installed several versions of Pythons on my Windows computer, for example Python 2.7-64, Python 2.7-32, and Python 3.7-32.

Python 3 includes "py" and "pyw" which helps me to easily start different Pythons, for example:

• "py -2.7" starts Python 2.7-64
• "py -2.7-32" starts Python 2.7-32
• "py -3.7-32" starts Python 3.7-32

What I'm wondering is, how to check how many different versions of Python did I install on my Windows PC and what versions are they?

PyCharm is able to find it but, for one thing, I don't know if it is a complete list, and for another, I wonder if there is any tool provided by Python or the operating system can do it.

Answer 1

Please note I'm not asking "how to check which version of Python did I install".

I've installed several versions of Pythons on my Windows computer, for example Python 2.7-64, Python 2.7-32, and Python 3.7-32.

Python 3 includes "py" and "pyw" which helps me to easily start different Pythons, for example:

• "py -2.7" starts Python 2.7-64
• "py -2.7-32" starts Python 2.7-32
• "py -3.7-32" starts Python 3.7-32

What I'm wondering is, how to check how many different versions of Python did I install on my Windows PC and what versions are they?

PyCharm is able to find it but, for one thing, I don't know if it is a complete list, and for another, I wonder if there is any tool provided by Python or the operating system can do it.

Answer 2

if you are using windows type in CMD

where python

and get something like this

C:\Python310\python.exe
C:\Users\facundo\AppData\Local\Microsoft\WindowsApps\python.exe
C:\Users\facundo\AppData\Local\Programs\Python\Python38\python.exe

Answer 3

Please note I'm not asking "how to check which version of Python did I install".

I've installed several versions of Pythons on my Windows computer, for example Python 2.7-64, Python 2.7-32, and Python 3.7-32.

Python 3 includes "py" and "pyw" which helps me to easily start different Pythons, for example:

• "py -2.7" starts Python 2.7-64
• "py -2.7-32" starts Python 2.7-32
• "py -3.7-32" starts Python 3.7-32

What I'm wondering is, how to check how many different versions of Python did I install on my Windows PC and what versions are they?

PyCharm is able to find it but, for one thing, I don't know if it is a complete list, and for another, I wonder if there is any tool provided by Python or the operating system can do it.

Answer 4

As I got from running python -2,

Requested Python version (2) not installed, use -0 for available pythons PS C:\\Users\\ASUS> py -0 Installed Pythons found by C:\\Windows\\py.exe Launcher for Windows -3.9-64 *

As in, use command py -0

Answer 5

In cmd run:

py --list

My result (all versions of python intalled):

 -V:3.11 *        Python 3.11 (64-bit)
 -V:3.9
 -V:3.8           Python 3.8 (64-bit)
 -V:3.6           Python 3.6 (64-bit)
 -V:3.5
 -V:ContinuumAnalytics/Anaconda39-64 Anaconda py39_4.12.0