Printable Progress Bar for Python

ProgressBar.py

# -*- coding: utf-8 -*-

import sys

class ProgressBar():
    """Printable progress bar.
    """

    def __init__(
        self, total, iterator=0, prefix='Progress',
        suffix='Completed', decimals=1, bar_length=50
    ):
        """Initialize instance and print process bar at 0 percent
        completed.
        
        :param int total:
            Total number of cycles to iterate through.
        :param int iterator:
            Current cycle. Typically leave at default value.
        :param str prefix:
            Text to prepend before progress bar.
        :param str suffix:
            Text to append after progress bar.
        :param int decimals:
            Round percent shown to this decimal place.
        :param int bar_length:
            Display length of progress bar.
        """
        self.bar_len = bar_length
        self.decimals = decimals
        self.iterator = iterator
        self.prefix = prefix
        self.suffix = suffix
        self.total = total
        self.update()

    def update(self):
        """Update progress bar. Call once per cycle.
        """
        str_format = "{0:." + str(self.decimals) + "f}"
        percents = str_format.format(100 * (self.iterator / float(self.total)))
        f_length = int(round(self.bar_len * self.iterator / float(self.total)))
        bar = '█' * f_length + '-' * (self.bar_len - f_length)

        sys.stdout.write('\r%s |%s| %s%s %s'
                %(self.prefix, bar, percents, '%', self.suffix))

        if self.iterator == self.total:
            sys.stdout.write('\n')
        sys.stdout.flush()
        self.iterator += 1

Class based update to this Gist

Change █ character to = for Windows compatibility