Output of python program | Set 11(Lists)

Pre-requisite: List in python 1) What is the output of the following program?

Python

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

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?

Python

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

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?

Python

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

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) What is the output of the following program?

Python

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)

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?

Python

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)

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. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.