Simple progress bar

progress.py

import sys

class Progress():
    def __init__(self, capacity, label = '', width=80, fill='#', blank=' '):
        self.capacity = capacity
        self.label = label
        self.width = width
        self.fill = fill
        self.blank = blank
        self.completed = 0

    def __str__(self):
        pc = self._percent()
        s = '\r\033[K{0}[{1}{2}] {3:.2f}%{4}'.format(
                self.label,
                self.fill*self._fillchars(),
                self.blank*self._blankchars(),
                pc * 100,
                '\n' if pc >= 1 else ''
            )
        return s

    def update(self, n):
        if self.completed >= self.capacity:
            return
        self.completed += n
        sys.stdout.write(self.__str__())
        sys.stdout.flush()

    def _percent(self):
        return float(self.completed) / self.capacity

    def _fillchars(self):
        pc = self._percent()
        return int(pc * (self.width - 2))

    def _blankchars(self):
        return self.width - 2 - self._fillchars()

if __name__ == '__main__':
    import time
    
    # Demo
    p = Progress(250, 'xoxo')
    for i in range(250):
        p.update(1)
        time.sleep(0.02)