Python coding challenge - Day 5 | Output Prediction MCQ

   What Is the Output of This python Code?

Question :

x = [10, 20, 30]

print(x * 2)

Options :

A) [10, 20, 30, 10, 20, 30]
B) [20, 40, 60]
C) [10, 20, 30, 2]
D) Error

correct answer :

A) [10, 20, 30, 10, 20, 30]




Explanation :

First we create a list :

x = [10, 20, 30]

The list contains 3 elements.




Step 1 - List Multiplication :

x * 2

In python multiplying a list does not multiply the values.

Instead it repeats the list elements.

Step 2 - Repeating the list :

[10, 20, 30] * 2

Python repeats the list 2 times.

SO the result becomes:

[10, 20, 30, 10, 20, 30]

Step 3 - Print statement :

print(x * 2) 

The output wiil be :

[10, 20, 30, 10, 20, 30]

Final Output :

[10, 20, 30, 10, 20, 30]

Key points :

The * operator with list repeats the list elements not the values.

Example :

[1, 2] * 3

Output:

[1, 2, 1, 2, 1, 2]

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