>>> for item in range(6):
...     print(item)
... 
0
1
2
3
4
5
>>> for item in range(2,5):
...     print(item)
... 
2
3
4
>>> for item in range(2, 105, 7):
...     print(item)
... 
2
9
16
23
30
37
44
51
58
65
72
79
86
93
100
>>> for item in range(0, 1, .1):
...     print(item)
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'float' object cannot be interpreted as an integer
>>> for item in range(5):
...     print("Bart is a brat.")
... 
Bart is a brat.
Bart is a brat.
Bart is a brat.
Bart is a brat.
Bart is a brat.
>>> for item in range(10, -1, -1):
...     print(item)
... 
10
9
8
7
6
5
4
3
2
1
0
>>> for item in reversed(range(0, 11)):
...     print(item)
... 
10
9
8
7
6
5
4
3
2
1
0
>>> x = ["a", "b", "c", "d", "e"]
>>> for k in x:
...     print(k)
... 
a
b
c
d
e
>>> t = ("a", "b", "c", "d", "e")
>>> for k in t:
...     print(k)
... 
a
b
c
d
e
>>> d = {"cat":"meow", "dog":"woof", "pig":"reeeet"}
>>> 
>>> for k in d:
...     print(k)
... 
cat
dog
pig
>>> for k in d.values():
...     print(k)
... 
meow
woof
reeeet
>>> d.values()
dict_values(['meow', 'woof', 'reeeet'])
>>> s = {5,2,9,0,"cow", "pig", "horse"}
>>> for k in s:
...     print(k)
... 
0
cow
2
pig
5
horse
9
>>> for k in s:
...     print(k)
... 
0
cow
2
pig
5
horse
9
>>> ^D
MAC:Mon Feb 28:08:45:0228> python
Python 3.10.0 (v3.10.0:b494f5935c, Oct  4 2021, 14:59:19) [Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> fp = open("sampler.txt", "r")
>>> for k in fp:
...     print(k, end="")
... 
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567890
!@#$%^&*()
>>> fp.tell()
76
>>> fp.seek(0)
0
>>> guts = fp.read()
>>> guts
'abcdefghijklmnopqrstuvwxyz\nABCDEFGHIJKLMNOPQRSTUVWXYZ\n1234567890\n!@#$%^&*()\n'
>>> "def" in guts
True
>>> fp.close()
>>> import os
>>> files = os.listdir()
>>> for k in files:
...     print(k)
... 
sampler.txt
>>> ^D
MAC:Mon Feb 28:08:50:0228> vi copy.py
MAC:Mon Feb 28:08:57:0228> python copy.py sampler.txt foo.txt
MAC:Mon Feb 28:08:58:0228> diff sampler.txt foo.txt 
MAC:Mon Feb 28:08:58:0228> cat foo.txt 
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567890
!@#$%^&*()
MAC:Mon Feb 28:08:58:0228> cp copy.py copy_better.py
MAC:Mon Feb 28:08:58:0228> vi copy_better.py 
MAC:Mon Feb 28:09:01:0228> python copy_better.py sampler.txt foo.txt
MAC:Mon Feb 28:09:01:0228> cat foo.txt
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567890
!@#$%^&*()
MAC:Mon Feb 28:09:01:0228> python copy_better.py heffalump.imagainary foo.txt
You are attempting to copy from a nonexistent file.
MAC:Mon Feb 28:09:02:0228> python copy_better.py 
Usage:  python copy.py donor recipient
MAC:Mon Feb 28:09:02:0228> vi zz.py
MAC:Mon Feb 28:09:16:0228> cp ~/data/scrabble.txt .
MAC:Mon Feb 28:09:16:0228> !p
python zz.py
bezazz

bezazzes

pazazz

pazazzes

pizazz

pizazzes

pizazzy

pizzaz

pizzazes

pizzazz

pizzazzes

pizzazzy

razzamatazz

razzamatazzes

razzmatazz

razzmatazzes

zizzle

zizzled

zizzles

zizzling

zyzzyva

zyzzyvas

zzz

MAC:Mon Feb 28:09:16:0228> 
MAC:Mon Feb 28:09:16:0228> !vi
vi zz.py
MAC:Mon Feb 28:09:16:0228> !p
python zz.py
bezazz
bezazzes
pazazz
pazazzes
pizazz
pizazzes
pizazzy
pizzaz
pizzazes
pizzazz
pizzazzes
pizzazzy
razzamatazz
razzamatazzes
razzmatazz
razzmatazzes
zizzle
zizzled
zizzles
zizzling
zyzzyva
zyzzyvas
zzz
MAC:Mon Feb 28:09:16:0228> !vi
vi zz.py