Lists - Chapter 10

Question 1

Are lists mutable or immutable?

Answer 1

Mutable

Question 2

The values in a list are called “ “ or sometimes “ “.

Answer 2

elements or items.

Question 3

A list within another list is called?

Answer 3

Nested

Question 4

A list with no elements is called?

Answer 4

An Empty List

Question 5

If you need to write or update the elements in a list using indices. What built-in functions could you use?

Answer 5

range and len
for i in range(len(list)):
list[i] = list[i] * 2

Question 6

Although a list can contain another list, the nested list still counts as a single….

Answer 6

Element

Question 7

What will the outcome of this be?
a = [1, 2, 3]
b = [4, 5, 6]
c = a + b
print(c)

Answer 7

[1, 2, 3, 4, 5, 6]

Question 8

What will the outcome of this be?
[1, 2, 3] * 3

Answer 8

[1, 2, 3, 1, 2, 3, 1, 2, 3]

Question 9

t = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’,]
What happens if we do the following?
t[:]

Answer 9

The slice will be a complete copy of the list.

Question 10

What will the following output be?
t = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’]
t[1:3] = [‘x’, ‘y’]
print(t)

Answer 10

[‘a’, ‘x’, ‘y’, ‘d’, ‘e’, ‘f’]

Question 11

This method takes a list as an argument and appends all of the elements.

Answer 11

**list.extend()
»> t1 = [1, 2, 3]
»> t2 = [4, 5, 6]
»> t1.extend(t2)
»> t1
[1, 2, 3, 4, 5, 6] **

Question 12

” “ arranges the elements of a list from low to high.

Answer 12

**list.sort()
»> t = [‘c’, ‘d’, ‘a’, ‘b’, ‘e’]
»> t.sort()
»> t
[‘a’, ‘b’, ‘c’, ‘d’, ‘e’] **

Question 13

Most list methods are “ “; they modify the list and return “ “

Answer 13

void and return None

Question 14

Give an example of an augmented assignment statement

Answer 14

variable += x
Which is equivalent to
** variable = variable + x**

Question 15

A variable used to collect the sum of the elements is sometimes referred to as?

Answer 15

Accumulator
def capitalize(t):
res = []
for s in t:
res.append(s.capitalize())
return res

In this instance, res is the accumulator.

Question 16

An operation that changes a sequence of elements into a single value is sometimes called?

Answer 16

reduce

Question 17

What is the following operation called?
def only_upper(t):
res = []
for s in t:
if s.isupper():
res.append(s)
return res

Answer 17

A filter

Question 18

Most common list operations can be expressed as a combination of which 3 things?

Answer 18

map, filter, reduce

Question 19

” “ modifies the list and returns the element that was removed.

Answer 19

variable.pop()
»> t = [‘p’, ‘o’, ‘p’]
»> x = t.pop(1)
»> t
[‘p’]

Question 20

If you do not provide an index for pop, what happens?
»> t = [‘p’, ‘o’, ‘p’]
»> x = t.pop()
»> t

Answer 20

The last element is removed.
»> x
[‘p’]

Question 21

What is the return value for remove?

Answer 21

None

Question 22

A string is a sequence of characters and a list is a sequence of?

Answer 22

Values

Question 23

To convert from a string to a list, you can use?

Answer 23

list
»> b = ‘batman’
»> j = list(b)
»> j
[‘b’, ‘a’, ‘t’, ‘m’, ‘a’, ‘n’]

Question 24

The list function breaks a string into individual letters. If you want to break a string into words, what should you use?

Answer 24

variable.split()
»> s = ‘pining for the fjords’
»> t = s.split()
»> t
[‘pining’, ‘for’, ‘the’, ‘fjords’]

Question 25

An optional argument called a “ “ specifies which characters to use as word boundaries.

Answer 25

delimiter

Question 26

” “ is the inverse of split. It takes a list of strings and concatenates the elements.

Answer 26

join

Question 27

To check whether two variables refer to the same object, you can use the “ “ operator.

Answer 27

is

Question 28

If two objects are “ “, they are also equivalent, but if they are equivalent, they are not necessarily “ “.

Answer 28

identical

Question 29

If another list has the same elements, we say it has the
same value, but it is not the same “ “.

Answer 29

object

Question 30

The association of a variable with an object is called a “ “.

Answer 30

reference

Question 31

An object with more than one reference has more than one name, so we say that the object is “ “.

Answer 31

aliased

Question 32

If the aliased object is “ “, changes made with one alias affect the other.

Answer 32

mutable

Question 33

Before using list “ “ and operators, you should read the documentation carefully and then test them in interactive mode.

Answer 33

methods

Question 34

Define list:

Answer 34

A sequence of values

Question 35

Define element:

Answer 35

One of the values in a list (or other sequence), also called items

Question 36

A processing pattern that traverses a sequence and performs an operation on each element is called what?

Answer 36

map

Question 37

A processing pattern that traverses a list and selects the elements that satisfy some criterion.

Answer 37

filter

Question 38

Something a variable can refer to…

Answer 38

**object. An object has a type and a value. **

Question 39

A circumstance where two or more variables refer to the same object is called?

Answer 39

Aliasing