FAITH/sam/example/utility/loading_bar.py

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 '') + "┈┨"