Python: Test whether the given strings are palindromes

Python Programming Puzzles: Exercise-12 with Solution

Check Palindromes in List

Write a Python program to check whether the given strings are palindromes or not. Return True otherwise False.

Input:
['palindrome', 'madamimadam', '', 'foo', 'eyes']

Output:
[False, True, True, False, False]

Visual Presentation:

Sample Solution-1:

Python Code:

# License: https://bit.ly/3oLErEI

# Define a function named 'test' that takes a list of strings 'strs' as input
def test(strs):
    # Use a list comprehension to check if each string in 'strs' is a palindrome (reads the same forwards and backwards)
    return [s == s[::-1] for s in strs]

# Create a list of strings 'strs' with specific elements
strs = ['palindrome', 'madamimadam', '', 'foo', 'eyes']

# Print the original list of strings
print("Original strings:")
print(strs)

# Print a message indicating the operation to be performed on the list
print("\nTest whether the given strings are palindromes or not:")

# Print the result of the test function applied to the 'strs' list
print(test(strs))

Sample Output:

Original strings:
['palindrome', 'madamimadam', '', 'foo', 'eyes']

Test whether the given strings are palindromes or not:
[False, True, True, False, False]

Flowchart:

Sample Solution-2:

Python Code:

# Define a function named 'test' that takes a list of strings 'strs' as input
def test(strs):
    # Initialize an empty list 'results' to store the results of palindrome tests
    results = []
    
    # Iterate through each string in 'strs'
    for _ in strs:
        # Padding each string with spaces on both sides
        # By default, the pad_to parameter is 50
        s = ' ' * 50 + _ + ' ' * 50
        
        # Initialize variables 'i' and 'j' for indexing the string 's'
        i = 0
        j = len(s) - 1

        # Use a while loop to check if the string 's' is a palindrome
        while i < j:
            if s[i] != s[j]:
                # If characters at positions 'i' and 'j' are not equal, append False to 'results' and break out of the loop
                results.append(False)
                break
            else:
                # Increment 'i' and decrement 'j' to compare the next pair of characters
                i += 1
                j -= 1
        else:
            # If the while loop completes without a break, append True to 'results'
            results.append(True)
    
    # Return the list of results
    return results

# Create a list of strings 'strs' with specific elements
strs = ['palindrome', 'madamimadam', '', 'foo', 'eyes']

# Print the original list of strings
print("Original strings:")
print(strs)

# Print a message indicating the operation to be performed on the list
print("\nTest whether the given strings are palindromes or not:")

# Print the result of the test function applied to the 'strs' list
print(test(strs))

Sample Output:

Original strings:
['palindrome', 'madamimadam', '', 'foo', 'eyes']

Test whether the given strings are palindromes or not:
[False, True, True, False, False]

Flowchart:

Python Code Editor :

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