Starting out with Python Chapter 7

A ___________ is an object that holds multiple items of data, stored one after the other. You can perform operations on a sequence to examine and manipulate the items stored in it.

sequence

A _______ is mutable: the program can change it's contents.

list

A ________ is immutable: once created, the contents cannot be changed

tuple

Lists are dynamic data structures, meaning that items may be added or removed from them. (True or False)

True

Each item in a list is called a(n) __________.

element

even_numbers = [2, 4, 6, 8, 10]

is an example of what?

list

A list can hold items of different types? (True or False)

True

Is the code below representative of a repetition operator?

num = [1, 2, 3]

x = 5

num * x

yes

A _______________ makes multiple copies of a list and joins them all together.

repetition operator

You can iterate over a list with a for loop? (True or False)

True

Each element in a list has a ________ that specifies its' position in the list.

index

What number does indexing start at?

0

What number would the final term in a list be indexed at?

The number of items in the list minus 1.

You can't use negative indexes to reference elements in a list. (True or False)

False

An ____________ will be raised when you use an invalid index with a list.

IndexError

What value will the following code return?

my_list = [a, b, c, d, e, f]

size = len(my_list)

6

What is the output of the following code?

list1 = [a, b, c]

list2 = [d, e, f]

list3 = list1 + list2

print(list3)

[a, b, c, d, e, f]

What is the value of list1 after the following code?

list1 = [a, b]

list2 = [c, d]

list += list2

[a, b, c, d]

You can concatenate lists with any other type of data. (True or False)

False

What will the following code display?

numbers = [1, 2, 3, 4, 5]

numbers[2] = 99

print(numbers)

[1, 2, 99, 4, 5]

What will the following code display?

numbers = list(range(3))

print(numbers)

[ 0, 1, 2]

What will the following code display?

numbers = [10] * 5

print(numbers)

[10, 10, 10, 10, 10]

What will the following code display?

numbers = list(range(1, 10, 2))

for n in numbers:

print(n)

1

3

5

7

9

What will the following code display?

numbers = [1, 2, 3, 4, 5]

print(numbers[-2])

4

How do you find the number of elements in a list?

Using the len() function.

What will the following code display?

numbers1 = [1, 2, 3]

numbers2 = [10, 20, 30]

numbers3 = numbers1 + numbers2

print(numbers1)

print(numbers2)

print(numbers3)

[1, 2, 3]

[10, 20, 30]

[1, 2, 3, 10, 20, 30]

What will the following code display?

numbers1 = [1, 2, 3]

numbers2 = [10, 20, 30]

numbers2 += numbers1

print(numbers1)

print(numbers2)

[1, 2, 3]

[10, 20, 30, 1, 2, 3]

A ________ is a span of items that are taken from a sequence.

slice

What prints out in the following code?

days = [Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday]

mid_days = days[2:5]

print(mid_days)

['Tuesday', 'Wednesday', 'Thursday']

The first element of a list is what number index?

0

In the example below, what will print out?

li = [1, 2, 3, 5]

li_section = li[1:3]

print(li_section)

[2, 3]

If you leave out the start index when slicing an expression, Python uses __ as the starting index.

0

If you leave out the end index when slicing an expression, Python uses _____________ as the end index.

The length of the list.

Invalid indexes cause slicing expressions to raise an exception. (True or False)

False

If the end index specifies a position beyond the end of the list, an exception will be raised. (True or False)

False

If the start index specifies a position before the beginning of the line, Python will use 0 instead. (True or False)

True

If the start index is greater than the end index, the expression will return a(n) ___________.

empty list

What will the following code display?

numbers = [1, 2, 3, 4, 5]

my_list = numbers[1:3]

print(my_list)

[2, 3]

What will the following code display?

numbers = [1, 2, 3, 4, 5]

my_list = numbers[:1]

print(my_list)

[1]

What will the following code display?

numbers = [1, 2, 3, 4, 5]

my_list = numbers[1:]

print(my_list)

[2, 3, 4, 5]

What will the following code display?

numbers = [1, 2, 3, 4, 5]

my_list = numbers[:]

print(my_list)

[1, 2, 3, 4, 5]

What will the following code display?

numbers = [1, 2, 3, 4, 5]

my_list = numbers[-3:]

print(my_list)

[3, 4, 5]

You can search for an item in a list using the __ operator.

in

What will the following code display?

names = ['Jim', 'Jill', 'John', 'Jasmine']

if 'Jasmine' not in names:

print('Cannot find Jasmine')

else:

print('Jasmines family:')

print(names)

['Jim', 'Jill', 'John', 'Jasmine']

_______ have numerous methods that allow you to work with the elements that they contain. Python also provides some built-in functions that are useful for working with _____.

lists

This list method adds the item passed to its argument to the end of a list.

append

This list method returns the index of the first list element whose value is equal to the item passed to its argument.

index

When using an index method on a list, if the item passed as an argument to the function is not found in the list, a ValueError is raised. (True or False)

True

When using the insert method, if you specify an index beyond the end of the list, the item will be inserted into the _____ of the list.

end

When using the insert method, if you specify a negative number with an invalid index, the item will be inserted into the _____ of the list.

beginning

The ______ method inserts an item into the list at a specified index.

insert

The _____ method sorts the items in a list so they appear in ascending order.

sort

The _______ method removes the first occurrence of an item from the list. If the item is not found, a ValueError is raised.

remove

If you want to remove an item at a specific index in a list, you would use the ___ statement.

del

If you want to return the highest value in a list, you would use the ___ statement.

max

If you want to return the lowest value in a list, you would use the ___ statement.

min

Calling a remove statement in a list removes the element at a specified index. (True or False)

False

Calling a del statement in a list removes the element at a specified index. (True or False)

True

How do you find the lowest value in a list?

min()

How do you find the largest value in a list?

max()

Which of the following statements would you use to add the string 'Wendy' to the list at index 0?

name = []

a. names[0] = 'Wendy'

b. names.append('Wendy')

b

A ____________________ list is a list that has other lists as its elements.

two-dimensional

Two-dimensional lists are also called ________ lists.

nested

A _______ is an immutable sequence, which mean that it's content cannot be changed.

tuple

Tuples are enclosed in ___________.

parentheses

Lists are enclosed in ________.

brackets

Tuples support the same operations as lists, except those that change the content of the list. (True or False)

True

A list is processed faster than a tuples. (True or False)

False

Data in a tuple can be changed. (True or False)

False

Some operations in Python require a tuple. (True or False)

True

What function would you use to convert a tuple to a list?

list()

What function would you use to convert a list to a tuple?

tuple()

What command would you use for matplotlib?

import matplotlib

Each function call when you import matplotlib, must be prefixed by __________?

matplotlib.pyplot

If you want to use the plt prefix to call functions, what statement would you write to import matplotlib?

import matplotlib.pyplot as plt

import matplotlib.pyplot as plt allows you to use which prefix to call functions?

plt

In order to create a line graph in matplotlib, you must create two separate lists for the x and y coordinates. (True or False)

True

To create a graph in matplotlib, we would call the ______function.

plot()

What command would you use to show the graph in matplotlib?

plt.show()

What function would you use to create a title for a graph?

plt.title()

What would you use to remove an element from a specific index?

del()

When working with multiple sets of data, one would typically use a(n)

nested list

The sort method rearranges the elements of a list so they are in ascending or descending order. (True or False)

False

The remove method removes all occurrences of an item from a list. (True or False)

False

What method can be used to place an item at a specific index in a list?

insert()

What method or operator can be used to concatenate lists?

+

What is the first negative index in a list?

-1

What list will be reference by the variable number after the following code is executed?

number = range(0, 9, 2)

[0, 2, 4, 6, 8]

A list cannot be passed as an argument to a function. (True or False)

False