Checkpoints

#14.1
Tuples are like lists, but their elements are fixed; that is, once a tuple is created, you
cannot add new elements, delete elements, replace elements, or reorder the elements in
the tuple.
To create a tuple from a list: t = tuple(lst)
To create a list from a tuple: lst = list(tpl)

#14.2
t is a tuple, which its elements are fixed; we
cannot used append and remove functions or change its content.

#14.3
Yes. Now t1 and t2 refer to the same tuple.

#14.4
(1, 2, 3, 7, 9, 0, 5)
1
(2, 3)
5
(1, 2, 3, 7, 9, 0)
(2, 3, 7, 9, 0)

#14.5
9
0
27
7

#14.6
False
True
False
True

#14.7
st = set() or st = {}

#14.8
Yes.

#14.9
s = {1, 3, 4}   # Correct
s = {{1, 2}, {4, 5}} # Incorrect, because unhashable set
s = {[1, 2], [4, 5]} # Incorrect, because unhashable list
s = {(1, 2), (4, 5)} # Correct (1, 2), (4, 5) are tuples. They are hashable

#14.10
Sets are like lists to store a collection of items. Unlike lists,
the elements in a set are unique and are not placed in any particular ordered.
To create a set from a list, use set(list). To create a list from a set, use list(set).

#14.11
{'peter', 'john'}
{'peter', 'john'}
{'peter', 'peterson', 'john'}
{'peterson', 'john'}

#14.12
Yes. It will throw an exception.

#14.13
True
False
False
False
True
True

#14.14
4
6
1
16

#14.15
{1, 3, 4, 5, 6, 7}
{1, 3, 4, 5, 6, 7}
{1, 6}
{1, 6}
{4, 5}
{4, 5}
{3, 4, 5, 7}
{3, 4, 5, 7}

#14.16
False
True
4
11
2
23
True
True

#14.17
{1, 2, 3} {3, 4, 5} {1, 2, 3, 4, 5}
{1, 2, 3} {3, 4, 5} {1, 2}
{1, 2, 3} {3, 4, 5} {3}
{1, 2, 3} {3, 4, 5} {1, 2, 4, 5}

#14.18
dict = {}

#14.19
d = {1:[1, 2], 3:[3, 4]}
d = {1:"john", 3:"peter"}
d = {"john":1, "peter":3}

#14.20
The two parts of a dictionary are the key and its corresponding value.

#14.21
(a) Adds a new item "susan":5
(b) Updates the value of the key "peter" to 5
(c) Adding 5 to the existing value of key "peter"
(d) Delete the item with key "peter"

#14.22
(a) Prints the length of the dictionary, 2
(b) Prints the keys of the dictionary, "john" and "peter"
(c) Prints the values of the dictionary, 3 and 2
(d) Prints the key/value pairs of the dictionary, {"john":3, "peter":2}

#14.23
4
['red', 'blue', 'green', 'yellow']
[4, 1, 14, 2]
True
False
11

#14.24
5

#14.25
In case of the key does not exist in the d,
d[key] raises an exception while d.get(key) returns None.