Python not working in command prompt?

Question

I type python into the command line, but the command prompt says that python is not recognized as an internal or external command, operable program, or batch fi

Answer 1

I have installed the latest Python for Win10 from Releases for Windows. Just typing py in the Command Prompt Window starts Python.

Microsoft Windows [Version 10.0.15048]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\sg7>py
Python 3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 18:11:49) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>`enter code here`

Testing:

>>> print("hello!")
hello!
>>>

Please be aware that in my case Python was installed in C:\Users\sg7\AppData\Local\Programs\Python\Python36> directory

C:\Users\sg7\AppData\Local\Programs\Python\Python36>dir
 Volume in drive C is Windows7_OS
 Volume Serial Number is 1226-12D1

 Directory of C:\Users\sg7\AppData\Local\Programs\Python\Python36

08/05/2018  07:38 AM              .
08/05/2018  07:38 AM              ..
12/18/2017  09:12 AM              DLLs
12/18/2017  09:12 AM              Doc
12/18/2017  09:12 AM              include
12/18/2017  09:12 AM              Lib
12/18/2017  09:12 AM              libs
10/03/2017  07:17 PM            30,334 LICENSE.txt
10/03/2017  07:17 PM           362,094 NEWS.txt
10/03/2017  07:15 PM           100,504 python.exe
10/03/2017  07:12 PM            58,520 python3.dll
10/03/2017  07:12 PM         3,610,776 python36.dll
10/03/2017  07:15 PM            98,968 pythonw.exe
08/05/2018  07:38 AM           196,096 Removescons.exe
08/05/2018  07:38 AM            26,563 scons-wininst.log
08/05/2018  07:38 AM              Scripts
12/18/2017  09:12 AM              tcl
12/18/2017  09:12 AM              Tools
06/09/2016  11:53 PM            87,888 vcruntime140.dll
               9 File(s)      4,571,743 bytes
              10 Dir(s)  20,228,898,816 bytes free

When I am at C:\Users\sg7> directory level python can be invoked by typing AppData\Local\Programs\Python\Python36\python

C:\Users\samg>AppData\Local\Programs\Python\Python36\python
Python 3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 18:11:49) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

Newer Python 3.7 will be installed at: C:\Users\YourUserNameHere\AppData\Local\Programs\Python\Python37

If you wish you can add to your path environment variable: %USERPROFILE%\AppData\Local\Programs\Python\Python36