Chapter 10: Tuples

Question 1

A type where one value can be checked to see if it is greater than, less than, or equal to another value of the same type. Can be put in a list and sorted.

Answer 1

comparable

Question 2

A collection of related values, often organized in lists, dictionaries, tuples, etc.

Answer 2

data structure

Question 3

A pattern that involves building a list of tuples, sorting, and extracting part of the result.

Answer 3

DSU

Question 4

The operation of assembling a variable-length argument tuple.

Answer 4

gather/
tuple packing

Question 5

A type that has a hash function. Immutable types like integers, floats, and strings are this; mutable types like lists and dictionaries are not.

Answer 5

hashable

Question 6

The operation of treating a sequence as a list of arguments.

Answer 6

scatter

Question 7

A summary of the type, size, and composition of a data structure.

Answer 7

shape
(of a data structure)

Question 8

A list (or other sequence) with a single element.

Answer 8

singleton

Question 9

An immutable sequence of elements.
Can be any type
Indexed by integers and can be sliced
Comparable and hashable (can sort lists of them and use as key values in dictionaries)

Answer 9

tuple

Question 10

A technique where a sequence on the right is assigned to multiple variables on the left at the same time. The right side is evaluated and then its elements are assigned to the variables on the left.
Also works with lists that have same number of items

Answer 10

tuple unpacking/ assignment
x, y = (1, 2)
x=1
y=2

Question 11

tuple notation

Answer 11

t = ‘a’, ‘b’, ‘c’
OR
t = (‘a’, ‘b’, ‘c’)
t1 = (‘a’,)

Question 12

function to create tuple

Answer 12

tuple()
tuple(‘word’) = (‘w’, ‘o’, ‘r’, ‘d’)
tuple([list]) = (item1, item2, item3)

Question 13

method to create modified tuple with changes by adding new tuple with slice of original tuple

Answer 13

tuple replacement
t = (‘a’, ‘b’, ‘c’)
t = (‘A’,) + t[1:] = (‘A’, b’, ‘c’)

Question 14

using operators to compare sequential tuple elements. Returns true or false depending on first mismatching pair of values

Answer 14

tuple comparison

Question 15

building a LIST of tuples with one or more sort keys (eg. length of word) preceding the elements (eg. word) from the sequence

Answer 15

Decorate
(DSU)

Question 16

use list method to put list of tuples in order. Compares 1st element in tuple pair, only looks at 2nd element to break ties

Answer 16

Sort
list.sort()
(DSU)

Question 17

extract the sorted sequence elements

Answer 17

Undecorate
(DSU)

Question 18

method format to sort list in decreasing order

Answer 18

list.sort(reverse=True)

Question 19

swap values of two variables in a single statement using tuples
can use with any kind of sequence
form of tuple unpacking

Answer 19

a, b = b, a
left side= variables. right side= expressions
ride side evaluated before assigned to left side variables

Question 20

dictionary method that returns a list of tuples (key-value pairs)
way to output contents of dictionary sorted by key

Answer 20

.items()

t = dict_name.items()

Question 21

term meaning no particular order

Answer 21

hash key order

Question 22

built-in function that takes sequence as parameter and returns same elements in opposite order
needs list() function before it

Answer 22

list(reversed())

Question 23

built-in function that takes sequence as parameter and returns same elements in order
does NOT need list() function before it

Answer 23

sorted()

Question 24

way to create a list from another list

Answer 24

list comprehension

int_strings = [‘42’, ‘65’, ‘12’]
list_of_ints = [int(x) for x in int_strings ]
print(sum(list_of_ints))

Question 25

errors caused when a data structure has the wrong type, size, or composition or the wrong type introduced in the code

Answer 25

shape error

Question 26

function that constructs or creates object instances
eg. tuple function constructs tuples

Answer 26

constructor function