Loader in Python

loader.py

import sys
import time

cols = 59
steps = 100

if len(sys.argv) > 2:
    steps = int(sys.argv[1])

for s in range(steps):
    percent =  s / steps * cols-1
    real_percent = s / steps * 100
    print(f"\r{real_percent:6.2f} [", end='')
    i = 0
    while i < percent and i < cols:
        i+=1
        print('=', end='')
    
    print('>', end='')
    
    i+=1

    while i > percent and i < cols:
        i+=1
        print(' ', end='')
    
    loading = "-\\|/"
    char = loading[s%4]
    print(f"] {char} ETA {steps-s}", end='', flush=True)
    time.sleep(1)

print("\nFinished!")