Python coding challenge - Day 7 | Output Prediction MCQ

   What Is the Output of This python Code?

Question :

x = [1, 2, 3]

print(len(x + [4, 5]))

Options :

A) 3

B) 4

C) 5

D) Error

Correct answer:

C) 5

Explanation:

First we create a list :

x = [1, 2, 3]

The list  x contains 3  elements.

Step 1 - List Concatenation

x + [4, 5]

The + operator joins two lists together.

So python combines both lists:

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

Result:

[1, 2, 3, 4, 5]

Step 2 - len ( ) Function

len(x + [4, 5])

The len ( ) function returns the number of elements in the list.

The new list contains:

1, 2, 3, 4, 5

Index positions :

Index :   0   1   2   3   4

Value :   1   2   3   4   5

so the list has 5 elements therefore:

 len([1, 2, 3, 4, 5]) = 5

Total elements = 5

Final output:

5

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