(base) MAC:Mon Mar 08:14:10:0308F> !vi
vi snake.py
(base) MAC:Mon Mar 08:14:21:0308F> vi banner.py
(base) MAC:Tue Mar 09:09:23:0308F> cd ..
(base) MAC:Tue Mar 09:09:23:ch4> mkdir 0309B
(base) MAC:Tue Mar 09:09:23:ch4> cd 0309B
(base) MAC:Tue Mar 09:09:23:0309B> ls
(base) MAC:Tue Mar 09:09:23:0309B> cd ../0308F
(base) MAC:Tue Mar 09:09:24:0308F> ls
banner.py  default.py example.py output.txt snake.py
(base) MAC:Tue Mar 09:09:24:0308F> cd -
/Users/morrison/20202021/S2/4240/ch4/0309B
(base) MAC:Tue Mar 09:09:24:0309B> vi mary.py
(base) MAC:Tue Mar 09:09:44:0309B> ls
mary.py
(base) MAC:Tue Mar 09:09:44:0309B> python by_value.py
[1, 2, 3, 4]
[1, 4, 3, 2]
[1, 4, 3, 2]
(base) MAC:Tue Mar 09:09:51:0309B> python for.py
[1, 2, 3, 4]
[1, 2, 3, 4]
(base) MAC:Tue Mar 09:10:06:0309B> python for.py
[1, 2, 3, 4]
0
0
0
0
[1, 2, 3, 4]
(base) MAC:Tue Mar 09:10:07:0309B> python for.py
[1, 2, 3, 4]
1
2
3
4
[1, 2, 3, 4]
(base) MAC:Tue Mar 09:10:08:0309B> python for.py
[1, 2, 3, 4]
[1, 2, 3, 4]
[0, 0, 0, 0]
(base) MAC:Tue Mar 09:10:09:0309B>