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Output of Python Programs | Set 23 (String in loops)

  • Last Updated : 14 Dec, 2017

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

1. What is the output of the following?




my_string = "geeksforgeeks"
i = "i"
while i in my_string:
    print(i, end =" ")
  1. None
  2. geeksforgeeks
  3. i i i i i i …
  4. g e e k s f o r g e e k s

Output:

1. None

Explanation: ‘i’ is not present in string ‘geeksforgeeks’

2. What is the output of the following?




i = 0
while i < 3:
    print(i)
    i += 1
else:
    print(0)
  1. 0 1 2 3 0
  2. 0 1 2 0
  3. 0 1 2
  4. Error

Output:

2. 0 1 2 0

Explanation: The else part is executed when the condition in the while statement is false.



3. What is the output of the following?




my_string = 'geeksforgeeks'
for i in range(my_string):
    print(i)
  1. 0 1 2 3 … 12
  2. geeksforgeeks
  3. None
  4. Error

Output:

4. Error

Explanation: range(str) is not allowed.

4. What is the output of the following?




my_string = 'geeksforgeeks'
for i in range(len(my_string)):
    my_string[i].upper()
print (my_string)
  1. GEEKSFORGEEKS
  2. geeksforgeeks
  3. Error
  4. None

Output:

2. geeksforgeeks

Explanation: Changes do not happen in-place, rather it will return a new instance of the string.

5. What is the output of the following?




my_string = 'geeksforgeeks'
for i in range(len(my_string)):
    print (my_string)
    my_string = 'a'
  1. gaaaaaaaaaaaa
  2. geeksforgeeks a a a a a a a a a a a a
  3. Error
  4. None

Output:

2. geeksforgeeks a a a a a a a a a a a a

Explanation: String is modified only after ‘geeksforgeeks’ has been printed once.




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