Category: Preeti Arora Solution

Python method called read_diary_file that reads the content from a text file named “DIARY.TXT” line by line and displays it on the screen: def read_diary_file(): try: with open(“DIARY.TXT”, ‘r’) as file: for line in file: print(line.rstrip()) except FileNotFoundError: print(“DIARY.TXT file not found.”) # Example usage: read_diary_file()   The read_diary_file method opens the file “DIARY.TXT” in…

Python method called write_multiple_lines that writes multiple lines of text content into a text file named “mylife.txt”: def write_multiple_lines(contents): try: with open(“mylife.txt”, ‘w’) as file: file.writelines(contents) print(“Text content written successfully to ‘mylife.txt’.”) except IOError: print(“Error occurred while writing to file.”) # Example usage: text_contents = [“This is line 1.\n”, “This is line 2.\n”, “This is…

Python program that displays all the records in a file along with their line numbers: def display_records_with_line_numbers(filename): try: with open(filename, ‘r’) as file: for line_number, line in enumerate(file, start=1): print(f”Line {line_number}: {line.rstrip()}”) except FileNotFoundError: print(f”File ‘{filename}’ not found.”) filename = input(“Enter the filename: “) display_records_with_line_numbers(filename)   When you run the program, it prompts you to…

Python function called remove_lowercase that accepts two file names as arguments and copies all lines that do not start with a lowercase letter from the first file into the second file: def remove_lowercase(source_file, destination_file): try: with open(source_file, ‘r’) as file1, open(destination_file, ‘w’) as file2: for line in file1: if not line.strip().startswith(tuple(‘abcdefghijklmnopqrstuvwxyz’)): file2.write(line) print(“Lines copied successfully.”)…

Here’s a Python program that calculates the size of a file after removing end-of-line (EOL) characters, leading and trailing white spaces, and blank lines: def calculate_file_size(filename): try: with open(filename, ‘r’) as file: modified_content = [] for line in file: line = line.strip() # Remove leading and trailing white spaces if line: # Skip blank lines…

Reading a file line by line from beginning is a common task. What if you want to read a file backward? This happens when you need to read log files. Write a program to read and display content of file from end to beginning. Reading a file backward can be achieved by using seek and…

Here’s a Python program that accepts a filename from the user and displays all the lines from the file that contain the Python comment character ‘#’: def display_comment_lines(filename): try: with open(filename, ‘r’) as file: for line in file: if ‘#’ in line: print(line.strip()) except FileNotFoundError: print(f”File ‘{filename}’ not found.”) filename = input(“Enter the filename: “)…

Here’s a Python program that reads a file called ‘Story.txt’, creates another file called ‘Index.txt’, and stores an index of the words in ‘Story.txt’, indicating the line numbers where each word appears: def create_word_index(input_file, output_file): word_index = {} with open(input_file, ‘r’) as file: for line_number, line in enumerate(file, start=1): words = line.strip().split() for word in…

To insert a sentence into a very large text file without loading the entire file into memory, you can use a technique called “file buffering” or “file rewriting.” Here’s an example function in Python that demonstrates this approach: def insert_sentence(filename, sentence, line_number): temp_filename = filename + “.tmp” with open(filename, ‘r’) as original_file, open(temp_filename, ‘w’) as…

Write a function in Python to count and display the number of lines starting with alphabet “A” present in a text file “LINES.TXT”, e.g., the file “LINE.TXT” contains the following lines: A boy is playing there. There is a playground. An aeroplane is in the sky. Alphabets & numbers are allowed in password. The function…