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question:Design a programming function that, when supplied with a textual string as input, executes a procedure to reverse the sequence of characters in the string. The function should then identify and return the longest palindromic substring present in the newly reversed string.
answer:def longest_palindromic_substring(s): Returns the longest palindromic substring in the reversed string of s. def is_palindrome(sub): return sub == sub[::-1] def longest_palindrome(s): n = len(s) if n == 0: return "" longest = s[0] for i in range(n): for j in range(i + len(longest), n + 1): substring = s[i:j] if is_palindrome(substring) and len(substring) > len(longest): longest = substring return longest reversed_s = s[::-1] return longest_palindrome(reversed_s)
question:Given a string and a number, print the string the number of times specified by the number. However, the string must be printed in reverse order each time it is repeated. Instead of using a loop or built-in functions, you need to come up with a recursive solution to solve this problem. The string will only contain uppercase and lowercase letters. The time complexity of the solution should be O(n), where n is the length of the string.
answer:def print_reversed_string_recursive(s, n): Recursively prints the reverse of the string s, n times. Parameters: - s (str): The string to be reversed and printed. - n (int): The number of times the reversed string should be printed. # Base case: if n is 0, return an empty string if n == 0: return "" # Recursive case reversed_s = s[::-1] # Reverse the string return reversed_s + "n" + print_reversed_string_recursive(s, n-1)
question:Write a function in Python that takes two arguments, a list of strings and a letter, and returns the strings which contains the letter. The function should return a list of the words in the order they appear in the original list.
answer:def filter_words_containing_letter(words, letter): Returns a list of words that contains the specified letter. Parameters: words (list): List of strings to filter letter (str): The letter to filter words by Returns: list: List of words that contain the specified letter return [word for word in words if letter in word]
question:Write a script to compress a large text file. The script should read the file line by line, compress each line using the gzip compression algorithm, and save the compressed lines to a new file. In addition, handle any exceptions that might occur during the process, such as file not found or insufficient disk space.
answer:import gzip import os def compress_file(input_file_path, output_file_path): Compresses the content of a text file line by line using gzip compression algorithm. try: with open(input_file_path, 'rt') as file_in, gzip.open(output_file_path, 'wt') as file_out: for line in file_in: file_out.write(line) return True except FileNotFoundError: print("The file was not found.") return False except IOError as e: print(f"An I/O error occurred: {e}") return False