progressbar.py

class ProgressBar:
    
    def __init__(self, n):
        self.total = n
        self.counter = 0
        self.prev_time = time()
        self.time_deltas = []
        
    def next(self):
        self.counter += 1
        left = self.total - self.counter
        
        time_delta = time() - self.prev_time
        self.prev_time = time()
        self.time_deltas.append(time_delta)
        est_time_left = left * np.median(self.time_deltas)
        
        timer_str = "est time left: {:5.0f}s".format(est_time_left)
        progress_str = "Progress: {}{} | {}".format("#"*self.counter, "-"*(left), timer_str)

        print('\r'+progress_str, end='')
        if self.counter == self.total:
            print(' ✔︎')