Output of python program | Set 11(Lists)

Pre-requisite: List in python

1) What is the output of the following program?

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data = [2, 3, 9]
temp = [[x for x in[data]] for x in range(3)]
print (temp)

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a) [[[2, 3, 9]], [[2, 3, 9]], [[2, 3, 9]]]
b) [[2, 3, 9], [2, 3, 9], [2, 3, 9]]
c) [[[2, 3, 9]], [[2, 3, 9]]]
d) None of these

Ans. (a)
Explanation: [x for x in[data] returns a new list copying the values in the list data and the outer for statement prints the newly created list 3 times.

2) What is the output of the following program?

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data = [x for x in range(5)]
temp = [x for x in range(7) if x in data and x%2==0]
print(temp)

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a) [0, 2, 4, 6]
b) [0, 2, 4]
c) [0, 1, 2, 3, 4, 5]
d) Runtime error

Ans. (b)
Explanation: The is statement checks whether the value lies in list data and if it does whether it’s divisible by 2. It does so for x in (0, 7).

3) What is the output of the following program?

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temp = ['Geeks', 'for', 'Geeks']
arr = [i[0].upper() for i in temp]
print(arr)

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a) [‘G’, ‘F’, ‘G’]
b) [‘GEEKS’]
c) [‘GEEKS’, ‘FOR’, ‘GEEKS’]
d) Compilation error

Ans. (a)
Explanation: The variable i is used to iterate over each element in list temp. i[0] represent the character at 0th index of i and .upper() function is used to capitalize the character present at i[0].

4) Whats is the output of the following program?

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temp = 'Geeks 22536 for 445 Geeks'
data = [x for x in (int(x) for x in temp if x.isdigit()) if x%2 == 0]
print(data)

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a) [2, 2, 6, 4, 4]
b) Compilation error
c) Runtime error
d) [‘2’, ‘2’, ‘5’, ‘3’, ‘6’, ‘4’, ‘4’, ‘5’]

Ans. (a)
Explanation: This is an example of nested list comprehension. The inner list created contains a list of integer in temp. The outer list only procures those x which are a multiple of 2.

5) What is the output of the following program?

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data = [x for x in (x for x in 'Geeks 22966 for Geeks' if x.isdigit()) if 
(x in ([x for x in range(20)]))]
print(data)

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a) [2, 2, 9, 6, 6]
b) []
c) Compilation error
d) Runtime error

Ans. (b)
Explanation: Since here x have not been converted to int, the condition in the if statement fails and therefore, the list remains empty.

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