﻿ Python Exercise: Checks whether a passed string is palindrome or not - w3resource

# Python Exercise: Checks whether a passed string is palindrome or not

## Python Functions: Exercise-12 with Solution

Write a Python function that checks whether a passed string is a palindrome or not.

Note: A palindrome is a word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run.

Sample Solution:

Python Code:

``````# Define a function named 'isPalindrome' that checks if a string is a palindrome
def isPalindrome(string):
# Initialize left and right pointers to check characters from the start and end of the string
left_pos = 0
right_pos = len(string) - 1

# Loop until the pointers meet or cross each other
while right_pos >= left_pos:
# Check if the characters at the left and right positions are not equal
if not string[left_pos] == string[right_pos]:
# If characters don't match, return False (not a palindrome)
return False

# Move the left pointer to the right and the right pointer to the left to continue checking
left_pos += 1
right_pos -= 1

# If the loop finishes without returning False, the string is a palindrome, so return True
return True

# Print the result of checking if the string 'aza' is a palindrome by calling the 'isPalindrome' function
print(isPalindrome('aza'))
```
```

Sample Output:

```True
```

Explanation:

In the exercise above the code defines a function named "isPalindrome()" that checks whether a given string is a palindrome (reads the same forwards and backwards). It uses two pointers (left_pos and right_pos) to traverse the string from both ends towards the middle, checking each character pair. Finally, it prints the result of checking whether the string 'aza' is a palindrome (which is True in this case).

Pictorial presentation:

Flowchart:

Python Code Editor:

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