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from sys import stdout


def cli_progress_bar(start, end, bar_length=50):
    """
    Prints out a Yum-style progress bar (via sys.stdout.write).
    `start`: The 'current' value of the progress bar.
    `end`: The '100%' value of the progress bar.
    `bar_length`: The size of the overall progress bar.

    Example output with start=20, end=100, bar_length=50:
    [###########----------------------------------------] 20/100 (100%)

    Intended to be used in a loop. Example:
    end = 100
    for i in range(end):
        cli_progress_bar(i, end)

    Based on an implementation found here:
        http://stackoverflow.com/a/13685020/1149774
    """
    percent = float(start) / end
    hashes = '#' * int(round(percent * bar_length))
    spaces = '-' * (bar_length - len(hashes))
    stdout.write(
        "\r[{0}] {1}/{2} ({3}%)".format(
            hashes + spaces,
            start,
            end,
            int(round(percent * 100))
        )
    )
    stdout.flush()