progress_bar.py

import random, time

BAR = chr(9608) # Character 9608 is "█"

def main():
    # simulate a download
    print("Progress bar simulation")
    bytes_downloaded = 0
    download_size = 2048
    while bytes_downloaded < download_size:
        # "Download" a random amout of bytes:
        bytes_downloaded += random.randint(0, 100)

        # Get the progress bar string for this amount of progress:
        bar_string = get_progress_bar(bytes_downloaded, download_size)

        # don't print a newline at the end, and immediately flush the
        # printed string to the screen:
        print(bar_string, end='', flush=True)

        time.sleep(0.2)

        # print backspaces to move the text curso to the line's start:
        print('\b' * len(bar_string), end='', flush=True)

def get_progress_bar(progress, total, barWidth=40):
    """ Returns a string that represents a progress bar that has barWidth
    bars and has progressed progress amount out of a total amount.
    """

    progress_bar = '' # the progress bar will be a string value
    progress_bar += '[' # create the left end of the progress bar

    # make sure that the amount of progress is between 0 and total:
    if progress > total:
        progress = total
    if progress < 0:
        progress = 0

    # calculate the number of bars to display:
    number_of_bars = int((progress / total) * barWidth)
    
    progress_bar += BAR * number_of_bars # add the progress bar
    progress_bar += ' ' * (barWidth - number_of_bars) # add empty space
    progress_bar += ']' # add the right end of the progress bar

    # calculate the percentage complete:
    percent_complete = round(progress / total * 100, 1)

    # add the numbers:
    progress_bar += ' ' + str(progress) + '/' + str(total)

    return progress_bar

# if the program is run (instead of imported), run the game:
if __name__ == '__main__':
    main()