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Python Programs - Functions

Function to reverse a string - Python Program

Example 1 :

Python 
def reverse_string(s):
    """Return reversed string."""
    return s[::-1]

print(reverse_string("Python"))

Output

 
OUTPUT  :
nohtyP

Example 2 : Advanced Program

Python 
def reverse_string(s):
  """
  Reverses a given string.

  Args:
    s: The input string to be reversed.

  Returns:
    The reversed string.
  """
  return s[::-1]

# Example Usage and Output:
input_string_1 = input("Enter A String  : ")
reversed_string_1 = reverse_string(input_string_1)
print(f"Original string: '{input_string_1}'")
print(f"Reversed string: '{reversed_string_1}'")

input_string_2 = "Python is fun"
reversed_string_2 = reverse_string(input_string_2)
print(f"Original string: '{input_string_2}'")
print(f"Reversed string: '{reversed_string_2}'")

input_string_3 = ""
reversed_string_3 = reverse_string(input_string_3)
print(f"Original string: '{input_string_3}'")
print(f"Reversed string: '{reversed_string_3}'")

Output

 
OUTPUT  :
Enter A String  : Hello
Original string: 'Hello'
Reversed string: 'olleH'
Original string: 'Python is fun'
Reversed string: 'nuf si nohtyP'
Original string: ''
Reversed string: ''

Explanation:

Function Definition:

The code defines a function named reverse_string that takes one argument, s, which represents the string to be reversed.

String Slicing:

The core of the reversal is s[::-1]. This is a Python string slicing technique:

  • The first colon indicates the start of the slice (defaulting to the beginning of the string).
  • The second colon indicates the end of the slice (defaulting to the end of the string).
  • The -1after the second colon specifies a step of -1, which means the slice iterates through the string in reverse order, character by character.

 

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