Chapter 4: working with lists

Question 1

what does a for loop do?

Answer 1

a for loop pulls each individual value and associates it with the singular version of the list variable and then prints. this is repeated for each value in the list

Question 2

writ a simple for loop for a list

Answer 2

magicians = [‘alice’, ‘david’, ‘carolina’]
for magician in magicians:
print(magician)

Question 3

attach an f-string to a for loop

Answer 3

for magician in magicians:

print(f”{magician.title()}, that was a great trick!”)

Question 4

write a for loop with multiple f-strings and then write code after the for loop to summarize the for loop

Answer 4

for magician in magicians:
print(f”\n{magician.title()}, that was a great trick!”)
print(f”I can’t wait to see your next trick,
{magician.title()}!”)
print(“\nThank you, everyone. That was a great magic show!”)

Question 5

use range in a for loop to generate a series of numbers

think of what value the range will stop at before you print

Answer 5

for value in range(1, 5):

print(value)

Question 6

what number does the for loop stop at when using range?

Answer 6

the one before the number listed, if you go 1 to 5 it will stop at 4

Question 7

make a list in a variable from the range function

Answer 7

numbers = list(range(1, 6))

print(numbers)

Question 8

make a list in a variable from the range function, but only print the even numbers

Answer 8

even_numbers = list(range(0, 30, 2))

print(even_numbers)

Question 9

make an empty list, and put the first 10 square numbers into that list

Answer 9

squares = []
for value in range(1, 11):
       square = value ** 2
       squares.append(square)
or 
       squares.append(value**2)

Question 10

make a list of numbers, then print the sum,, min, and max of that list

Answer 10

digits = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
print(sum(digits))
print(min(digits))
print(max(digits))

Question 11

what is a list comprehension?

Answer 11

allows you to generate a list with just one line of code.

it combines a for loop and the creation of new elements into one line, and automatically append new elements

Question 12

write a list comprehension using the creation of the first 10 squared numbers

Answer 12

squares = [value**2 for value in range(1, 11)]

print(squares)

Question 13

Use a for loop to print the numbers from 1 to 20 inclusive from a list, both ways of making the list are fine.

Answer 13

numbers = list(range(1, 21))

for number in numbers:
print(number)

Question 14

Make a list of the multiples of 3 from 3 to 30. Use a for loop to print the numbers in your list.

Answer 14

threes = list(range(3, 31, 3))

for number in threes:
print(number)

Question 15

Use a list comprehension to generate a list of the first 10 cubes.

Answer 15

cubes = [number**3 for number in range(1,11)]

for cube in cubes:
print(cube)

Question 16

make a list with 10 values and slice parts of it

Answer 16

players = [‘charles’, ‘martina’, ‘michael’, ‘florence’, ‘sam’, ‘eli’, ‘jake’, ‘sean’, ‘matt’, ‘syd’]

print(players[0:3]

Question 17

slice the 2nd, 3rd, and 4th items of the list

Answer 17

print(players[1:4])

Question 18

what does omitting the first element of a slice do?

Answer 18

python automatically starts the slice at the beginning

Question 19

what does omitting the last element of a slice do?

Answer 19

the slice will go to the end

Question 20

loop through a slice

Answer 20

print(“here are the first three players on my team”)
for player in players[:3]:
print(player.title())

Question 21

make a list, and then make a new list by copying it

Answer 21

my_foods = ['pizza', 'falafel', 'carrot cake']
friends_foods = my_foods[:]

Question 22

add new values to your list and the new list

Answer 22

my_foods.appemd(‘cannoli’)

friends_foods.append(‘ice cream’)

Question 23

what does immutable mean

Answer 23

python values that cannot change

Question 24

what is an immutable list

Answer 24

a tuple

Question 25

make a simple tuple

Answer 25

dimensions = (200, 50)

print(dimensions[0])

Question 26

define a tuple with one element

Answer 26

my_t = (3,)

Question 27

loop through all the values in a tuple

Answer 27

for dimension in dimensions:

print(dimension)

Question 28

write over the tuple

Answer 28

dimensions = (200, 50)
dimensions = (400, 50