timer.py

import time
import math
import sys

start = time.time()
total = int(sys.argv[1]) * 60
deadline = start + total

def remains():
    now = time.time()
    if now > deadline:
        return 0
    else:
        return deadline - now


def format(secs):
    secs = int(secs)
    if not secs:
        return "##:##"
    minutes = secs // 60
    seconds = secs % 60
    return "% 2d:%02d" % (minutes, seconds)

def fun(secs):
    now = time.time()
    ceil = min(secs**2 / 100, (start - now)**2 / 100, 60)
    extra = max(0, math.sin(secs / 14.2))**4 * ceil
    return secs + extra

while True:
    time.sleep(.05)
    print(f"\n {format(fun(remains()))}")