How to set path in PYTHON

If you’ve installed Python in Windows using the default installation options, the path to the Python executable wasn’t added to the Windows Path variable. The Path variable lists the directories that will be searched for executables when you type a command in the command prompt. By adding the path to the Python executable, you will be able to access python.exe by typing the python keyword (you won’t need to specify the full path to the program).

    C:\>python
    'python' is not recognized as an internal or external command, operable program or batch file

As you can see from the output above, the command was not found. To run python.exe, you need to specify the full path to the executable:

    C:\>C:\Python34\python --version
    Python 3.4.3.

To add the path to the python.exe file to the Path variable, start the Run box and enter sysdm.cpl

This should open up the System Properties window. Go to the Advanced tab and click the Environment Variables button:

In the System variable window, find the Path variable and click Edit:

Position your cursor at the end of the Variable value line and add the path to the python.exe file, preceeded with the semicolon character (;). In our example, we have added the following value: C:\Python34

Close all windows. Now you can run python.exe without specifying the full path to the file:

NOTE : If you get the ‘python’ is not recognized as an internal or external command, operable program or batch file. error, there is something wrong with your Path variable. Note also that you will have to reopen all command prompt windows in order for changes to the Path variable take effect.