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 list:
print(list[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 a 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]