Data Types - List

Question 1

What is the fastest and most memory-efficient way to generate a list of numbers

Answer 1

list(range(n))

Question 2

fruits = [“apple”, “banana”, “cherry”]

Give 3 ways to remove “bananna” from this list

Answer 2

del fruits[1]

fruits.pop(1)

fruits.remove(“banana”)

Question 3

a = [ ]
a += 15

What does the above return

Answer 3

TypeError

+= can be used to extend a String, List or Tuple, but 15 is an integer.

Further, for List only, .extend() gives the same result ( .extend() is specific to Lists)

Question 4

a = [ ]

Give the best 2 ways to add the integer 15 to list “a” as an item

Answer 4

a.append(15)

a += [15]

Question 5

for item in lst:
print(lst[item])

What does the above print

Answer 5

TypeError

This treats “item” like it’s an index, but it’s an item (in this case an item in “list”).

If you want to print the Item, it should be typed as below,

for item in list:
print(item)

Question 6

lst = [7,2,9,4,7,1,8,5,3]

Find the total of these numbers

Answer 6

sum(lst)

Question 7

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

Print “5” from “lst”

Answer 7

print(lst[-1])

Question 8

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

Print “1” from “lst”

Answer 8

print(lst[0])

Question 9

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

what does each of the lines below print

lst[0]

lst[0:]

Answer 9

lst[0] = 0

lst[0:] = [1,2,3,4,5]

Question 10

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

what does each of the lines below print

lst[-1]

lst[-1:]

Answer 10

lst[-1] = 5

lst[-1:] = [5]