Week 8

Question 1

You cannot use a for loop to iterate over the characters in a string.

Answer 1

False

Question 2

Indexing works with both strings and lists.

Answer 2

True

Question 3

In slicing, if the end index specifies a position beyond the end of the string, Python will use the length of the string instead.

Answer 3

True

Question 4

Indexing of a string starts at 1 so the index of the first character is 1, the index of the second character is 2, and so forth.

Answer 4

False

Question 5

The index -1 identifies the last character of a string.

Answer 5

False

Question 6

The following expression is valid:
string[i] = ‘i’

Answer 6

False

Question 7

The following code will display ‘yes + no’:
mystr = ‘yes’
yourstr = ‘no’
mystr += yourstr
print(mystr)

Answer 7

False
yesno

Question 8

If the + operator is used on strings, it produces a string that is a combination of the two strings used as its operands.

Answer 8

True

Question 9

When accessing each character in a string, such as for copying purposes, you would typically use a while loop.

Answer 9

False

Question 10

If a whole paragraph is included in a single string, the split() method can be used to obtain a list of the sentences in the paragraph.

Answer 10

True

Question 11

The strip() method returns a copy of the string with all the leading whitespace characters removed but does not remove trailing whitespace characters.

Answer 11

True

Question 12

What are the valid indexes for the string ‘New York’?
a. 0 through 7
b. 0 through 8
c. -1 through -8
d. -1 through 6

Answer 12

0 through 7

Question 13

What will be displayed after the following code executes?
mystr = ‘yes’
yourstr = ‘no’
mystr += yourstr * 2
print(mystr)
a. yes + no * 2
b. yes + no yes + no
c. yesnono
d. yesnoyesno

Answer 13

c. yesnono

Question 14

What will be assigned to the variable s_string after the following code executes?
special = ‘1357 Country Ln.’
s_string = special[ :4]
a. ‘7’
b. ‘1357’
c. 5
d. ‘7 Country Ln.’

Answer 14

b. ‘1357’

Question 15

What will be assigned to the variable s_string after the following code executes?
special = ‘1357 Country Ln.’
s_string = special[4:]
a. ‘ Country Ln.’
b. ‘1357’
c. ‘Coun’
d. ‘57 C’

Answer 15

a. ‘ Country Ln.’

Question 16

What will be assigned to the variable s_string after the following code executes?
special = ‘1357 Country Ln.’
s_string = special[-3:]
a. ‘135’
b. ‘753’
c. ‘Ln.’
d. ‘y Ln’

Answer 16

c. ‘Ln.’

Question 17

What will be assigned to the variable some_nums after the following code executes?
special = ‘0123456789’
some_nums = special[0:10:2]
a. ‘0123456789’
b. ‘24682468’
c. ‘02468’
d. ‘02020202020202020202’

Answer 17

c. ‘02468’

Question 18

If the start index is __________ the end index, the slicing expression will return an empty string.
a. equal to
b. less than
c. greater than
d. less than or equal to

Answer 18

c. greater than

Question 19

What is the return value of the string method lstrip()?
a. the string with all whitespaces removed
b. the string with all leading whitespaces removed
c. the string with all leading tabs removed
d. the string with all leading spaces removed

Answer 19

b. the string with all leading whitespaces removed

Question 20

What is the first negative index in a string?
a. 0
b. -1
c. -0
d. the size of the string minus one

Answer 20

b. -1

Question 21

What will be assigned to the string variable pattern after the following code executes?
i = 3
pattern = ‘z’ * (5 * i)
a. ‘zzzzzzzzzzzzzzz’
b. ‘zzzzz’
c. ‘z * 15’
d. Nothing; this code is invalid

Answer 21

a. ‘zzzzzzzzzzzzzzz’

Question 22

Which method would you use to determine whether a certain substring is present in a string?
a. endswith(substring)
b. find(substring)
c. replace(string, substring)
d. startswith(substring)

Answer 22

b. find(substring)

Question 23

Which method would you use to determine whether a certain substring is the suffix of a string?
a. endswith(substring)
b. find(substring)
c. replace(string, substring)
d. startswith(substring)

Answer 23

a. endswith(substring)

Question 24

What list will be referenced by the variable list_strip after the following code executes?
my_string = ‘03/07/2018’
list_strip = my_string.split(‘/’)
a. [‘3’, ‘7’, ‘2018’]
b. [‘03’, ‘07’, ‘2018’]
c. [‘3’, ‘/’, ‘7’, ‘/’, ‘2018’]
d. [‘03’, ‘/’, ‘07’, ‘/’, ‘2018’]

Answer 24

b. [‘03’, ‘07’, ‘2018’]

Question 25

What will be the value of the variable string after the following code executes?
string = ‘abcd’
string.upper()
a. ‘abcd’
b. ‘ABCD’
c. ‘Abcd’
d. Nothing; this code is invalid

Answer 25

b. ‘ABCD’

Question 26

What will be the value of the variable string after the following code executes?
string = ‘Hello’
string += ‘ world!’
a. ‘Hello’
b. ‘ world!’
c. ‘Hello world!’
d. Nothing; this code is invalid

Answer 26

c. ‘Hello world!’

Question 27

What will display after the following code executes?
password = ‘ILOVEPYTHON’
if password.isalpha():
print(‘Invalid, must contain one number.’)
elif password.isdigit():
print(‘Invalid, must have one non-numeric character.’)
elif password.isupper():
print(‘Invalid, cannot be all uppercase characters.’)
else:
print(‘Your password is secure!’)
a. Invalid, must contain one number.
b. Invalid, must have one non-numeric character.
c. Invalid, must contain one number.
Invalid, cannot be all uppercase characters.
d. Your password is secure!

Answer 27

a. Invalid, must contain one number.

Question 28

Each character in a string has a(n) __________ which specifies its position in the string.

Answer 28

index

Question 29

A(n) __________ exception will occur if you try to use an index that is out of range for a particular string.

Answer 29

IndexError

Question 30

The isalpha() method returns __________ if the string contains only alphabetic characters and is at least one character in length.

Answer 30

true

Question 31

A(n) __________ is a span of characters that are taken from within a string.

Answer 31

slice

Question 32

When the operand on the left side of the * symbol is a string and the operand on the right side is an integer, the * becomes the ___________ operator.

Answer 32

repetition

Question 33

The third number in string slicing brackets represents the ___________ value.

Answer 33

step

Question 34

The __________ operator can be used to determine whether one string is contained in another string.

Answer 34

in

Question 35

The __________ method returns True if the string contains only numeric digits.

Answer 35

isdigit()

Question 36

The __________ method returns the list of the words in a string.

Answer 36

split()

Question 37

The __________ method returns a copy of the string with all the alphabetic letters converted to lower case.

Answer 37

lower()

Question 38

The ____ specifier is a special set of characters that specify how a value should be formatted.

Answer 38

formatting

Question 39

A(n) _____ character is a special character that is preceded with a backslash, appearing inside a string literal.

Answer 39

escape