Lists - General Questions

What is the output of the following code?

a = [1, 2, 3]
print(a.index(3), a.count(4))

What is the output of the following code?

a = [1, 2, 3]
b = a[:]
b[0] = 99
print(a[0])

What is the output of the following code?

a = [3, 1, 2]
a.sort(reverse=True)
print(a)

What is the output of the following code?

a = [3, 1, 2]
a.sort()
print(a)

Which list method removes and returns the item at a given index?