Output of Python Programs | Set 22 (Loops)

Prerequisite: Loops
Note: Output of all these programs is tested on Python3

1. What is the output of the following?
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mylist = ['geeks', 'forgeeks']
for i in mylist:
    i.upper()
print(mylist)

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  1. [‘GEEKS’, ‘FORGEEKS’].
    2. 

  2. [‘geeks’, ‘forgeeks’].
    3. 

  3. [None, None].
    4. 

  4. Unexpected
    5. 



Output:


2. [‘geeks’, ‘forgeeks’]



Explanation: The function upper() does not modify a string in place, it returns a new string which isn’t being stored anywhere.


        
          
          
          
        

            

2. What is the output of the following?











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mylist = ['geeks', 'forgeeks'] 


for i in mylist: 


    mylist.append(i.upper()) 


print(mylist) 



















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  1. [‘GEEKS’, ‘FORGEEKS’].
    2. 

  2. [‘geeks’, ‘forgeeks’, ‘GEEKS’, ‘FORGEEKS’].
    3. 

  3. [None, None].
    4. 

  4. None of these
    5. 



Output:


4. None of these



Explanation:The loop does not terminate as new elements are being added to the list in each iteration.


3. What is the output of the following?











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i = 1


while True: 


    if i % 0O7 == 0: 


        break


    print(i) 


    i += 1



















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  1. 1 2 3 4 5 6.
    2. 

  2. 1 2 3 4 5 6 7.
    3. 

  3. error.
    4. 

  4. None of these
    5. 



Output:


1. 1 2 3 4 5 6



Explanation: The loop will terminate when i will be equal to 7.


4. What is the output of the following?











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True = False


while True: 


    print(True) 


    break



















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  1. False.
    2. 

  2. True.
    3. 

  3. Error.
    4. 

  4. None of these
    5. 



Output:


3. Error



Explanation: SyntaxError, True is a keyword and it’s value cannot be changed.


5. What is the output of the following?











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i = 1


while True: 


    if i % 3 == 0: 


        break


    print(i) 


    i + = 1



















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  1. 1 2 3.
    2. 

  2. 1 2.
    3. 

  3. Syntax Error.
    4. 

  4. None of these
    5. 



Output:


3. Syntax Error



Explanation: SyntaxError, there shouldn’t be a space between + and = in +=.



          
          
          
          

            

    

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