Note - this is a printout of Jeff's python session from
running python and trying things out with lists and tuples.

Python 3.7.3 (default, Apr  3 2019, 21:34:18)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> L = []
>>> len(L)
0
>>> L.append("hello")\
...
>>> L
['hello']
>>> L.append(3)
>>> L
['hello', 3]
>>> L[0] = L[1]
>>> L
[3, 3]
>>> L[2] = 4
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range
>>> L.append(4)
>>> L
[3, 3, 4]
>>> L[-1]
4
>>> L[-2]
3
>>> L[-3]
3
>>> L[-4]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> del L[0]
>>> L
[3, 4]
>>> "hello" in L
False
>>> "3" in L
False
>>> [3] in L
False
>>> L.append([3])
>>> L
[3, 4, [3]]
>>> L[2]
[3]
>>> [3] in L
True
>>> L[2]
[3]
>>> L[2].append("hello")
>>> L
[3, 4, [3, 'hello']]
>>> len(L)
3
>>> T = (1, 2, 3)
>>> T
(1, 2, 3)
>>> T[0] = 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> T.append(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'append'
>>> L.append(T)
>>> L
[3, 4, [3, 'hello'], (1, 2, 3)]
>>> len(L)
4
>>> len(L[2])
2
>>> len(L[3])
3
>>> 3 in T
True
>>> "3" in T
False
>>> T in L
True
>>> [1, 2, 3] in L
False
>>> L in T
False
>>> L.remove(3)
>>> L
[4, [3, 'hello'], (1, 2, 3)]
>>> L.append(3)
>>> L.append(3)
>>> L
[4, [3, 'hello'], (1, 2, 3), 3, 3]
>>> help(L.remove)

>>> L.remove(3)
>>> L
[4, [3, 'hello'], (1, 2, 3), 3]
>>> L.remove(3)
>>> L.remove(5)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: list.remove(x): x not in list
>>> T.remove(2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'remove'
>>> L
[4, [3, 'hello'], (1, 2, 3)]
>>> L.index(4)
0
>>> L.index( (1,2,3) )
2
>>> L.index(5)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: 5 is not in list