se) MAC:Tue Sep 08:08:34:~> python
Python 3.7.4 (default, Aug 13 2019, 15:17:50) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>  x = [2,3,4,5,True,"cat"]
  File "<stdin>", line 1
    x = [2,3,4,5,True,"cat"]
    ^
IndentationError: unexpected indent
>>> x = [2,3,4,5,True,"cat"]
>>> x[0]
2
>>> x[-1]
'cat'
>>> x[-2]
True
>>> x = x[:-1]
>>> x
[2, 3, 4, 5, True]
>>> x[1:3
... ]
[3, 4]
>>> x[1:3] = ["A", "B", "C"]
>>> x
[2, 'A', 'B', 'C', 5, True]
>>> x[1:1] = "dawg"
>>> x
[2, 'd', 'a', 'w', 'g', 'A', 'B', 'C', 5, True]
>>> x[::2] = []
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: attempt to assign sequence of size 0 to extended slice of size 5
>>> x[::2] = 9,8,7,6,5
>>> x
[9, 'd', 8, 'w', 7, 'A', 6, 'C', 5, True]
>>> x = 0
>>> y = 1
>>> ## swap x and y?
... 
>>> tmp = x
>>> x = y
>>> y = tmp
>>> x
1
>>> y
0
>>> x,y = y,x
>>> x
0
>>> y
1
>>> x = ["Ethan", "Messier", "is", "nuts"]
>>> x[0], x[1] = x[1], x[0]
>>> x
['Messier', 'Ethan', 'is', 'nuts']
>>> one, two, three, four = x
>>> one
'Messier'
>>> two
'Ethan'
>>> three
'is'
>>> four
'nuts'
>>> one, two, three, four, five = x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: not enough values to unpack (expected 5, got 4)
>>> type(x)
<class 'list'>
>>> ## tuple: immutible list
... 
>>> t = (1,2,3,4,5)
>>> type(t)
<class 'tuple'>
>>> t[0]
1
>>> t[1:3]
(2, 3)
>>> (1,2,3) + (4,5,6)
(1, 2, 3, 4, 5, 6)
>>> t[0] = "hippopotamus"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> s = (1,2,3)
>>> t = (4,5,6)
>>> s + t
(1, 2, 3, 4, 5, 6)
>>> u = s
>>> u is s
True
>>> s += t
>>> s
(1, 2, 3, 4, 5, 6)
>>> u is s
False
>>> s = [1,2,3]
>>> t = [4,5,6]
>>> u = s
>>> s += t
>>> u is s
True
>>> # state for any sequeence: items present + order of items
... 
>>> x = 2
>>> y = 3
>>> x < 5 or y > 3
True
>>> x < 5 and y > 3
False
>>> True or False
True
>>> not True
False
>>>