Output of python program | Set 11(Lists)

Pre-requisite: List in python

1) What is the output of the following program?

filter_none

edit
close

play_arrow

link
brightness_4
code

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

chevron_right






                        filter_none








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?











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















data = [x for x in range(5)] 


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


print(temp) 



















                        chevron_right







                        filter_none








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?











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















temp = ['Geeks', 'for', 'Geeks'] 


arr = [i[0].upper() for i in temp] 


print(arr) 



















                        chevron_right







                        filter_none








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?











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















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) 



















                        chevron_right







                        filter_none








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?











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















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) 



















                        chevron_right







                        filter_none








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.


This article is contributed by Mayank Kumar. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@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.



          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts: