prog.py

from datetime import datetime
# get current date
now = datetime.now()
curtimestamp = now.strftime("%Y%m%d-%H:%M:%S")


def read_line(line: str) -> tuple:
    """
    Line format:

    2020-01-18 09:00:00, message
    """
    date, text = line.split(',', 1)
    return datetime.fromisoformat(date), text


def read_from_file(file_name) -> tuple:
    buffer = ""
    # read the text file with our message log
    buffer += 'Reading messages.txt\n'
    parsed_content = []
    try:
        with open(file_name) as file:
            for line in file:
                parsed_content.append(read_line(line))
    except FileNotFoundError:
        buffer += 'File not found\n'

    return buffer, parsed_content


def user_input():
    return input('Please enter a new message (type quit to exit): ')


def write_to_file(toAdd):
    with open('messages.txt', 'a') as f:
        f.write(f'{curtimestamp}, {toAdd}\n')


if __name__ == '__main__':
    buffer, parsed = read_from_file('messages.txt')
    print(buffer)
    while True:
        # ask for new input
        toAdd = input('Please enter a new message (type quit to exit): ')
        if toAdd == "quit":
            print("Bye!")
            break
        # string to write
        if toAdd:
            with open('messages.txt', 'a') as f:
                f.write(f'{curtimestamp}, {toAdd}\n')