eryksun added the comment:
Setting a new default for py.exe doesn't require admin privileges. You can use
the PY_PYTHON environment variable:
C:\>py --version
Python 2.7.10
C:\>set PY_PYTHON=3
C:\>py --version
Python 3.5.0
which you can easily persist in the registry using setx.exe:
C:\>setx PY_PYTHON 3
SUCCESS: Specified value was saved.
Check that it was saved:
C:\>reg query HKCU\Environment /v PY_PYTHON
HKEY_CURRENT_USER\Environment
PY_PYTHON REG_SZ 3
You can also use %LOCALAPPDATA%\py.ini to set the default:
C:\>py --version
Python 2.7.10
C:\>copy con "%localappdata%\py.ini"
[defaults]
python=3
^Z
1 file(s) copied.
C:\>py --version
Python 3.5.0
Note that the environment variable is preferred:
C:\Temp>set PY_PYTHON=2
C:\Temp>py --version
Python 2.7.10
and an active virtual environment is most preferred:
C:\Temp>py -3.5 -m venv testenv
C:\Temp>testenv\Scripts\activate.bat
(testenv) C:\Temp>py --version
Python 3.5.0
(testenv) C:\Temp>py -c "import sys; print(sys.prefix)"
C:\Temp\testenv
----------
nosy: +eryksun
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<http://bugs.python.org/issue25405>
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