week-4-python-assingment

File Read & Write Challenge 🖋️: Create a program that reads a file and writes a modified version to a new file. Error Handling Lab 🧪: Ask the user for a filename and handle errors if it doesn’t exist or can’t be read. Outcomes 🎉

By the end of this module, you’ll be skilled in managing files efficiently in Python, ensuring error-free code that gracefully handles unexpected issues. Mastering files and exception handling will allow you to build strong, robust applications!

def modify_and_write_file(input_filename, output_filename): """ Reads a file, modifies its content, and writes to a new file. Adds line numbers and converts text to uppercase as modification examples. """ try: with open(input_filename, 'r') as input_file: lines = input_file.readlines()

    # Modify content (add line numbers and uppercase)
    modified_lines = []
    for i, line in enumerate(lines, 1):
        modified_lines.append(f"{i}: {line.upper()}")
    
    with open(output_filename, 'w') as output_file:
        output_file.writelines(modified_lines)
        
    print(f"Successfully processed {input_filename} and wrote to {output_filename}")

except FileNotFoundError:
    print(f"Error: The file {input_filename} was not found.")
except PermissionError:
    print(f"Error: Permission denied when accessing {input_filename}.")
except Exception as e:
    print(f"An unexpected error occurred: {str(e)}")

Example usage:

modify_and_write_file('original.txt', 'modified.txt')

error handling

def read_file_with_handling(): """ Asks user for filename and handles potential errors gracefully. """ while True: filename = input("Enter the filename you want to read (or 'quit' to exit): ")

    if filename.lower() == 'quit':
        print("Goodbye!")
        break
        
    try:
        with open(filename, 'r') as file:
            content = file.read()
            print("\nFile content:")
            print("-" * 40)
            print(content)
            print("-" * 40)
            break
            
    except FileNotFoundError:
        print(f"Error: The file '{filename}' doesn't exist. Please try again.")
    except PermissionError:
        print(f"Error: You don't have permission to read '{filename}'. Please try another file.")
    except UnicodeDecodeError:
        print(f"Error: Couldn't decode '{filename}'. It might be a binary file.")
    except Exception as e:
        print(f"An unexpected error occurred: {str(e)}. Please try again.")

Example usage:

read_file_with_handling()