Python Program to Reverse a String

In this post, we will learn how to reverse a string using Python Programming language.

Reversing a string can be defined as an operation in which the original string which the user has entered is modified in such a way that characters in it arrange in reverse order, starting from the last character to the first character.

We will be reversing a string using following methods:

1. Using For Loop
2. Using Functions
3. Using While Loop

So, without further ado, let’s begin this tutorial.

Python Program to Reverse a String

# Python Program to Reverse a String
str = input("Enter a string: ")

# Defining reverse string
revstr = ""

for i in str:
    revstr = i + revstr

# Displaying output 
print("Original String: ", str)
print("Reverse String: ", revstr)

Output

Enter a string: Hello
Original String:  Hello
Reverse String:  olleH

How Does This Program Work ?

str = input("Enter a string: ")

The user is asked to enter a string which he wants to reverse.

# Defining reverse string
revstr = ""

Then, we declare a variable named revstr which will store the reverse of a string.

for i in str:
    revstr = i + revstr

• We reverse the string using for loop. 
• After first iteration, revstr = i + revstr = “H” + “” = H
• After second iteration, revstr = i + revstr = “e” + “H” = eH
• After third iteration, revstr = i + revstr = “l” + “eH” = leH
• After four iteration, revstr = i + revstr = “l” + leH = lleH
• And after fifth and last iteration, revstr = i + revstr = “o” + “lleH” = olleH

# Displaying output 
print("Original String: ", str)
print("Reverse String: ", revstr)

Finally, the reversed string is displayed on the screen using print() function.

Python Program to Reverse a String Using Functions

# Python Program to Reverse a String Using Functions
def Reverse(str):
    revstr = str[::-1]
    return revstr
    
# Asking for input
str = input("Enter a string: ")
result = Reverse(str)

# Displaying output
print("Original String: ", str)
print("Reversed String: ", result)

Output

Enter a string: Amazing
Original String:  Amazing
Reversed String:  gnizamA

Python Program to Reverse a String Using While Loop

# Python Program to Reverse a String Using While Loop
str = input("Enter a string: ")

revstr = ""
i = len(str) - 1

# Reversing the string
while (i >= 0):
    revstr = revstr + str[i]
    i = i - 1
    
# Displaying output
print("Original String: ", str)
print("Reversed String: ", revstr)

Output

Enter a string: CodingBroz
Original String:  CodingBroz
Reversed String:  zorBgnidoC

Conclusion

I hope after going through this post, you understand how to reverse a string using Python Programming language.

If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to solve your query.

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