#!/usr/bin/env python3
# coding=utf-8

class LoadingBar:
    def __init__(self, length: int = 40):
        self.length = length
        self.symbols = ["┈", "░", "▒", "▓"]

    def __call__(self, progress: float) -> str:
        p = int(progress * self.length * 4 + 0.5)
        d, r = p // 4, p % 4
        return "┠┈" + d * "█" + ((self.symbols[r]) + max(0, self.length - 1 - d) * "┈" if p < self.length * 4 else "") + "┈┨"