Python Syntactic Sugar: Practice Questions

For each snippet, write the output, the exception type, or “Runs Forever.” If it prints nothing, write “No Output”.

Question 1

[a, b] = [1, 2]
print('a=', a)

Answer

a= 1

Question 2

[a, b, c] = [1, 2]
print('a=', a)

Answer

ValueError

Question 3

[a, b] = 12
print('a=', a)

Answer

TypeError

Question 4

[a, b] = '12'
print('a=', a)

Answer

a= 1

Question 5

a, b = [1, 2]
print('a=', a)

Answer

a= 1

Question 6

a = 10
b = 5
a, b = b, a
print('a=', a)

Answer

a= 5

Question 7

a = 5
b = 10
for i in range(2, 5):
    a, b = b, a
print('a=', a)

Answer

a= 10

Question 8

total = 0
for a, b in [(1, 2), (3, 4)]:
    total += a
print('total=', total)

Answer

total= 4

Question 9

total = 0
for a, b in [(1, 2), (3, 4), 5]:
    total += a
print('total=', total)

Answer

TypeError

Question 10

total = 0
for a, b in [(1, 2), (3, 4, 5)]:
    total += a
print('total=', total)

Answer

ValueError

Question 11

result = ''
for a, b in zip('hello', 'world'):
    result += a
    result += b
print('result=', result)

Answer

result= hweolrllod

Question 12

names = ['alice', 'bob', 'charlie', 'dave', 'eve']
accumulator = []
for i, name in enumerate(names):
    text = name + ' is number ' + str(i)
    accumulator.append(text)
print('accumulator[3]=', accumulator[3])

Answer

accumulator[3]= dave is number 3

Question 13

names = ['alice', 'bob', 'charlie', 'dave', 'eve']
accumulator = []
for i, name in enumerate(names):
    text = 'number ' + str(i) + ' is ' + name
    accumulator.append(text)
print('accumulator[-1]=', accumulator[-1])

Answer

accumulator[-1]= number 4 is eve

Question 14

sentence = 'python is *weird*'
accumulator = ''
for i, char in enumerate(sentence):
    if char == '*' and sentence[i - 1] == ' ':
        accumulator += '_'
    elif char == '*':
        accumulator += '_!'
    else:
        accumulator += char
print('accumulator=', accumulator)

Answer

accumulator= python is _weird_!

Question 15

names = ['alice', 'bob', 'charlie', 'dave', 'eve']
greetings = ['hello ' + name for name in names]
greeting = greetings[2]
print('greeting=', greeting)

Answer

greeting= hello charlie

Question 16

xs = [x * x for x in range(10)]
num = xs[5]
print('num=', num)

Answer

num= 25

Question 17

xs = [x * x for x in range(10) if x % 2]
num = xs[3]
print('num=', num)

Answer

num= 49

Question 18

xs = [x**x for x in range(-3, 3)]
num = xs[5]
print('num=', num)

Answer

num= 4

Question 19

xs = [x for x in range(-3, 3) if x]
num = xs[3]
print('num=', num)

Answer

num= 1

Question 20

sentence = 'This is an example sentence with a few words in it.'
small_words = [word.lower() for word in sentence.split() if len(word) <= 2]
print('len(small_words)=', len(small_words))

Answer

len(small_words)= 4

Question 21

sentence = 'This is an example sentence with a few words in it.'
small_words = [word.lower() for word in sentence.split() if word <= 2]
print('len(small_words)=', len(small_words))

Answer

TypeError

Question 22

sentence = 'This is an example sentence with a few words in it.'
small_words = [word.lower() for word in sentence if len(word) <= 2]
print('len(small_words)=', len(small_words))

Answer

len(small_words)= 51

Question 23

names = ['alice', 'bob', 'charlie', 'dave', 'eve']
greetings = [name[0].upper() + name[1:].lower() for name in names]
greeting = greetings[1]
print('greeting=', greeting)

Answer

greeting= Bob

Question 24

names = ['alice', 'bob', 'charlie', 'dave', 'eve']
greetings = [names[0].upper() + names[1:].lower() for name in names]
greeting = greetings[1]
print('greeting=', greeting)

Answer

AttributeError

Question 25

sentence = 'This is an example sentence with a few words in it.'
words = [word.lower() for word in sentence.split() if 't' in word]
print('len(words)=', len(words))

Answer

len(words)= 3

Question 26

sentence = 'This is an example sentence with a few words in it.'
xs = [x.upper() for x in sentence if 't' in x]
print('xs[1]=', xs[1])

Answer

xs[1]= T

Question 27

responses = [('home', 200), ('archive', 404), ('search', 200)]
status_by_page = {page: status for page, status in responses}
print(status_by_page['archive'])
print('search' in status_by_page)

Answer

404
True

Question 28

xss = [[i for i in range(x)] for x in [2, 3, 4]]
x = xss[-1][-2]
print('x=', x)

Answer

x= 2

Question 29

xss = [[i for i in range(x)] for x in [2, 3, 4] if x % 2 == 0]
x = xss[-1][-2]
print('x=', x)

Answer

x= 2

Question 30

xss = [[i for i in range(x)] for x in [2, 3, 4] if x % 2 == 0]
x = xss[-1:][-2][1]
print('x=', x)

Answer

IndexError

Question 31

xss = [[i for i in range(x)] for x in [2, 3, 4] if x % 2 == 0]
x = xss[-1][-2:][1]
print('x=', x)

Answer

x= 3

Question 32

xss = [[i for i in range(x) if i % 3 == 1] for x in [4, 5, 6] if x % 2 == 1]
x = xss[-1][-1]
print('x=', x)

Answer

x= 4

Question 33

xss = [[i for i in range(x) if x % 3 == 1] for x in [4, 5, 6] if x % 2 == 1]
print('xss=', xss)

Answer

xss= [[]]

Question 34

xss = [i for x in [2, 3, 4] if x % 2 == 0 for i in range(x)]
x = xss[-1][-2]
print('x=', x)

Answer

TypeError

Question 35

xss = [i for x in [4, 5, 6] if x % 2 == 1 for i in range(x) if i % 3 == 1]
x = xss[-1]
print('x=', x)

Answer

x= 4

Question 36

xss = [i for x in [4, 5, 6] if x % 2 == 1 for i in range(x) if x % 3 == 1]
print('xss=', xss)

Answer

xss= []

Question 37

tweets = [
    {
        'source': 'Twitter Web Client',
        'text': (
            'From Donald Trump: Wishing everyone a wonderful holiday & '
            'a happy, healthy, prosperous New Year. Let\u2019s think like '
            'champions in 2010!'
        ),
        'retweet_count': 28,
    },
    {
        'source': 'Twitter Web Client',
        'text': (
            'Trump International Tower in Chicago ranked 6th tallest '
            'building in world by Council on Tall Buildings & Urban Habitat '
            'http://bit.ly/sqvQq'
        ),
        'retweet_count': 33,
    },
    {
        'source': 'Twitter Web Client',
        'text': 'Wishing you and yours a very Happy and Bountiful Thanksgiving!',
        'retweet_count': 13,
    },
    {
        'source': 'Twitter for iPhone',
        'text': (
            'RT @realDonaldTrump: Happy Birthday @DonaldJTrumpJr!\n'
            'https://t.co/uRxyCD3hBz'
        ),
        'retweet_count': 9529,
    },
    {
        'source': 'Twitter for iPhone',
        'text': ('Happy Birthday @DonaldJTrumpJr!\nhttps://t.co/uRxyCD3hBz'),
        'retweet_count': 9529,
    },
    {
        'source': 'Twitter for Android',
        'text': (
            'Happy New Year to all, including to my many enemies and '
            "those who have fought me and lost so badly they just don't "
            'know what to do. Love!'
        ),
        'retweet_count': 141853,
    },
    {
        'source': 'Twitter for Android',
        'text': (
            'Russians are playing @CNN and @NBCNews for such fools - '
            "funny to watch, they don't have a clue! @FoxNews totally "
            'gets it!'
        ),
        'retweet_count': 23213,
    },
    {
        'source': 'Twitter for iPhone',
        'text': (
            'Join @AmerIcan32, founded by Hall of Fame legend '
            '@JimBrownNFL32 on 1/19/2017 in Washington, D.C.\u2026 '
            'https://t.co/9WJZ8iTCQV'
        ),
        'retweet_count': 7366,
    },
]

trump_tweets = [tweet for tweet in tweets if 'trump' in tweet['text'].lower()]
print('len(trump_tweets)=', len(trump_tweets))

Answer

len(trump_tweets)= 4

Question 38

tweets = [
    {
        'source': 'Twitter Web Client',
        'text': (
            'From Donald Trump: Wishing everyone a wonderful holiday & '
            'a happy, healthy, prosperous New Year. Let\u2019s think like '
            'champions in 2010!'
        ),
        'retweet_count': 28,
    },
    {
        'source': 'Twitter Web Client',
        'text': (
            'Trump International Tower in Chicago ranked 6th tallest '
            'building in world by Council on Tall Buildings & Urban Habitat '
            'http://bit.ly/sqvQq'
        ),
        'retweet_count': 33,
    },
    {
        'source': 'Twitter Web Client',
        'text': 'Wishing you and yours a very Happy and Bountiful Thanksgiving!',
        'retweet_count': 13,
    },
    {
        'source': 'Twitter for iPhone',
        'text': (
            'RT @realDonaldTrump: Happy Birthday @DonaldJTrumpJr!\n'
            'https://t.co/uRxyCD3hBz'
        ),
        'retweet_count': 9529,
    },
    {
        'source': 'Twitter for iPhone',
        'text': ('Happy Birthday @DonaldJTrumpJr!\nhttps://t.co/uRxyCD3hBz'),
        'retweet_count': 9529,
    },
    {
        'source': 'Twitter for Android',
        'text': (
            'Happy New Year to all, including to my many enemies and '
            "those who have fought me and lost so badly they just don't "
            'know what to do. Love!'
        ),
        'retweet_count': 141853,
    },
    {
        'source': 'Twitter for Android',
        'text': (
            'Russians are playing @CNN and @NBCNews for such fools - '
            "funny to watch, they don't have a clue! @FoxNews totally "
            'gets it!'
        ),
        'retweet_count': 23213,
    },
    {
        'source': 'Twitter for iPhone',
        'text': (
            'Join @AmerIcan32, founded by Hall of Fame legend '
            '@JimBrownNFL32 on 1/19/2017 in Washington, D.C.\u2026 '
            'https://t.co/9WJZ8iTCQV'
        ),
        'retweet_count': 7366,
    },
]

popular_tweets = [tweet for tweet in tweets if tweet['retweet_count'] > 100]
print('len(popular_tweets)=', len(popular_tweets))

Answer

len(popular_tweets)= 5