Python Programming Practice Test 4

1. What will be the output of the following Python code?

a=[[]]*3
a[1].append(7)
print(a)

[[7], [], []]

Syntax error

[[],7, [], []]

[[7], [7], [7]]

2. What will be the output of the following Python code?

numbers = [1, 2, 3, 4]

numbers.append([5,6,7,8])

print(len(numbers))

3. What will be the output of the following Python code?

>>> a=(2,3,4)
>>> sum(a,3)

The method sum() doesn’t exist for tuples

Too many arguments for sum() method

4. Write a list comprehension to produce the list: [1, 2, 4, 8, 16……212].

[(2**x) for x in range(1, 13)]

[(2**x) for x in range(0, 13)]

[(x**2) for x in range(1, 13)]

[(x**2) for x in range(0, 13)]

5. Which of the following is the correct expansion of list_1 = [expr(i) for i in list_0 if func(i)]?

list_1 = []
for i in list_0:
    if func(i):
        list_1.append(expr(i))

none of the mentioned

list_1 = []
for i in list_0:
    if func(i):
        list_1.append(i)

for i in list_0:
    if func(i):
        list_1.append(expr(i))

6. What will be the output of the following Python code?

l=[[1, 2, 3], [4, 5, 6]]
for i in range(len(l)):
	for j in range(len(l[i])):
		l[i][j]+=10
l

Error

No output

[[11, 12, 13], [14, 15, 16]]

[[1, 2, 3], [4, 5, 6]]

7. Is the following Python code valid?

>>> a=(1,2,3,4)
>>> del a

Yes, first element in the tuple is deleted

No, invalid syntax for del method

No because tuple is immutable

Yes, the entire tuple is deleted

8. What will be the output of the following Python code?

l=[1,2,3,4,5]
[x&1 for x in l]

[1, 0, 1, 0, 1]

[1, 1, 1, 1, 1]

[0, 1, 0, 1, 0]

[1, 0, 0, 0, 0]

9. What will be the output of the following Python code?

a=[10,23,56,[78]]
b=list(a)
a[3][0]=95
a[1]=34
print(b)

[10,34,56,[78]]

[10,34,56,[95]]

[10,23,56,[78]]

[10,23,56,[95]]

10. Which of the following Python statements will result in the output: 6?

A = [[1, 2, 3],
     [4, 5, 6],
     [7, 8, 9]]

A[2][1]

A[1][2]

A[2][3]

A[3][2]