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Computer Science

Create a list SqLst that stores the doubles of elements of another list NumLst. Following code is trying to achieve this. Will this code work as desired ? What will be stored in SqLst after following code ?

NumLst = [2, 5, 1, 7, 3, 6, 8, 9]
SqLst = NumLst * 2

Linear Lists

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Answer

No, the above code will not work as desired.

[2, 5, 1, 7, 3, 6, 8, 9, 2, 5, 1, 7, 3, 6, 8, 9] will be stored in SqLst after the above code is executed. The multiplication operator * with a list NumLst, duplicates the elements of the list NumLst by 2 times.

Explanation

The correct code is:

NumLst = [2, 5, 1, 7, 3, 6, 8, 9]
SqLst = []
for num in NumLst:
    SqLst.append(num * 2)
print(SqLst)
Output
[4, 10, 2, 14, 6, 12, 16, 18]

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