Problems coexisting with multiple versions of Python in Windows

Original article, without my permission to the system reproduced.

In my windows, python3.4 was installed first, and later because of the need to install python2.7, the results found:

Directly double-clicking on the 1.py and command-line python 1.py using the Python interpreter is different.

Directly double-click, using the later installation of the D:\Python27\python.exe

command line input python 1.py, using the previously installed D:\Program Files (x86) \python3.4\python.exe

However, my PATH environment variable contains only 3.4 paths, and I don't know why it's so weird, but pay attention to this distinction.

the way to avoid the pit : use absolute path.

How to judge the Python interpreter in a script:

1. Write a simple print to see if it can be executed.

2. Use the dedicated version interface:

Import Platform
Print (Platform.python_version ())

Original article, without my permission to the system reproduced.

Problems coexisting with multiple versions of Python in Windows