# Python Multiple Choice Questions – Mapping Functions

This set of Python Interview Questions & Answers focuses on “Mapping Functions”.

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

```elements = [0, 1, 2]
def incr(x):
return x+1
print(list(map(elements, incr)))```

a) [1, 2, 3]
b) [0, 1, 2]
c) error
d) none of the mentioned

Explanation: The list should be the second parameter to the mapping function.

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

```elements = [0, 1, 2]
def incr(x):
return x+1
print(list(map(incr, elements)))```

a) [1, 2, 3]
b) [0, 1, 2]
c) error
d) none of the mentioned

Explanation: Each element of the list is incremented.
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3. What will be the output of the following Python code?

```x = ['ab', 'cd']
print(list(map(upper, x)))```

a) [‘AB’, ‘CD’]
b) [‘ab’, ‘cd’]
c) error
d) none of the mentioned

Explanation: A NameError occurs because upper is a class method.

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

```def to_upper(k):
return k.upper()
x = ['ab', 'cd']
print(list(map(upper, x)))```

a) [‘AB’, ‘CD’]
b) [‘ab’, ‘cd’]
c) none of the mentioned
d) error

Explanation: A NameError occurs because upper is a class method.

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

```def to_upper(k):
return k.upper()
x = ['ab', 'cd']
print(list(map(to_upper, x)))```

a) [‘AB’, ‘CD’]
b) [‘ab’, ‘cd’]
c) none of the mentioned
d) error

Explanation: Each element of the list is converted to uppercase.

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

```def to_upper(k):
k.upper()
x = ['ab', 'cd']
print(list(map(to_upper, x)))```

a) [‘AB’, ‘CD’]
b) [‘ab’, ‘cd’]
c) none of the mentioned
d) error

Explanation: A list of Nones is printed as to_upper() returns None.

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

```x = ['ab', 'cd']
print(map(len, x))```

a) [‘ab’, ‘cd’]
b) [2, 2]
c) [‘2’, ‘2’]
d) none of the mentioned

Explanation: A map object is generated by map(). We must convert this to a list to be able to print it in a human readable form.

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

```x = ['ab', 'cd']
print(list(map(len, x)))```

a) [‘ab’, ‘cd’]
b) [2, 2]
c) [‘2’, ‘2’]
d) none of the mentioned

Explanation: The length of each string is 2.

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

```x = ['ab', 'cd']
print(len(map(list, x)))```

a) [2, 2]
b) 2
c) 4
d) none of the mentioned

Explanation: A TypeError occurs as map has no len().

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

```x = ['ab', 'cd']
print(len(list(map(list, x))))```

a) 2
b) 4
c) error
d) none of the mentioned

Explanation: The outer list has two lists in it. So it’s length is 2.

More MCQs on Python Mapping Functions:

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