On Wed, Aug 10, 2016 at 1:46 PM, BartC <b...@freeuk.com> wrote: > On 10/08/2016 11:34, eryk sun wrote: >> >> On Wed, Aug 10, 2016 at 4:46 AM, <sh.aja...@gmail.com> wrote: >>> >>> i have installed python 3.5 , but the python command is not recognized >>> >>> C:\Users\sharmaaj>python >>> 'python' is not recognized as an internal or external command, >>> operable program or batch file. >>> >>> what should i do to run python commands. >> >> Modify your setup. Open "Programs and Features" from the control >> panel. Right-click the entry for Python 3.5 (not "Python Launcher") >> and select Uninstall/Change. In the dialog, click on "Modify". Click >> "Next" and select "Add Python to environment variables". Click >> "Install". When it's done, open a new command prompt and enter >> "python". > > That's an unusual way of doing it. And rather precarious as you're one wrong > click away from deleting Python altogether! > > It also, after doing the above, spent rather a long time copying files about > when the operation shouldn't need anything of the sort. > > However, I tried it and it didn't seem to work (opening a new prompt and > type 'python'). Maybe it needs a machine restart, but I can't be bothered to > try that on the off-chance it might work.
I did test that it works -- using the Python 3.5 installer, which was completely rewritten. It adds Python's installation and Scripts directories to PATH, and it doesn't need a reboot because the installer broadcasts a WM_SETTINGCHANGE "Environment" message that causes Explorer to reload its environment from the registry (the old installer doesn't do this). As to the procedure being unusual, I thought it would be simpler and more reliable than editing PATH in the old control-panel environment variable editor, which can be much worse if the user messes it up. Windows 10 has an improved editor that splits the value into separate text boxes and makes it easy to add entries and move them around, but most people are still using Windows 7. Also, the default installation path for a per-user installation of Python 3.5 is in the hidden folder "%LOCALAPPDATA%\Programs\Python\PythonXY[-32]". This can be difficult for users to find without inspecting the start-menu shortcuts or running `py -c "import sys;print(sys.prefix)"` -- assuming they used the default all-users installation of the py launcher to even be able to run py.exe. -- https://mail.python.org/mailman/listinfo/python-list
