Python String Reverse | Output MCQ | daily coding challenge | Day 9

  What Is the Output of This python Code?

Question :

x = "Python"

print(x[::-1])

Options :

A) Python

B) nohtyP

C) Pnohty

D) Error

Correct answer :

B) nohtyP




Explanation :

Step 1 - Creating the string

x = "Python"

A variable x stores the string: :

Python

A string in python is a sequence of characters.

Characters in the string :

P  y  t  h  o  n

Step 2 - understanding string index

Every character in a string has an index position.

Index :   0   1   2   3   4   5

Value :   P   y   t   h   o   n

Meaning :

x[0] → P

x[1] → y

x[2] → t

x[3] → h

x[4] → o

x[5] → n

Python also supports negative indexing.

Index :  -6  -5  -4  -3  -2  -1

Value :   P   y   t   h   o   n

Example :

x[-1] → n

x[-2] → o

Step  3 - understanding slicing 

Python allows extracting parts of string using slicing.

General syntax :

string[start : end : step]

Meaning :

Start →  Where slicing begins

end  →   Where slicing stops

step →    How many positions to move

Example :

x[0:3] → Pyt

Because it takes characters form index 0 to index 2.

Step 4 - Understanding  [: : -1]

The code uses :

x[::-1]

This means :

start → default (end of string)

end → default (beginning of string)

step → -1

The step -1 tells python to move backwards.

So python reads the string form right to left.

Step 5 - Reversing the string

Original string :

Python

Reading backwards :

n o h t y P

So the reversed string becomes :

nohtyP

Final output :

nohtyP

Key points :

[::-1] is  a common python trick to reverse strings

Strings supports indexing and slicing

A negative step (-1) reverses the order

Works for string , Lists  and tuples

Example :

[1,2,3] [: : -1]

Output :

[3,2,1]

Practice daily python coding challenges to improve your programming and logical thinking skills.

Happy coding ❤️