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

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

1. What is the output of the following?

Python3

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?

Python3

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?

Python3

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?

Python3

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?

Python3

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.