I am trying to install Python on a Max running OS 10.13.1 (so my son can use a 'Coding for Beginners' book). Both 2.7 and 3.6 have the same problem: Clicking on IDLE leads to the icon bouncing a couple of times in the dock, but not opening a shell. I have tried re-installing and restarting post install. Typing python or python3.6 into the terminal seems to launch Python successfully (details below). I am as new to coding as my son, please phrase any advice accordingly!

Thank you.

Last login: Fri Dec 29 16:26:57 on ttys000
mkdir: /Users/Steve Margetts/.bash_sessions: Permission denied
touch: /Users/Steve Margetts/.bash_sessions/79B2448C-E769-409D-A67D-7A96F8C3C348.historynew: No such file or directory
iMac:~ Steve Margetts$ python
Python 2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 12:01:12) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> help
Type help() for interactive help, or help(object) for help about object.
>>>

Last login: Fri Dec 29 16:30:16 on ttys000
mkdir: /Users/Steve Margetts/.bash_sessions: Permission denied
touch: /Users/Steve Margetts/.bash_sessions/5A516AB8-0481-4D55-A2BD-1B1017E52147.historynew: No such file or directory
iMac:~ Steve Margetts$ python3.6
Python 3.6.4 (v3.6.4:d48ecebad5, Dec 18 2017, 21:07:28) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>