Bisect: bisect() & insort()

bisect.py

import bisect
import random

# bisect()
def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'):
    i = bisect.bisect(breakpoints, score)
    return grades[i]
  
[grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]
# ['F', 'A', 'C', 'C', 'B', 'A', 'A']


# insort()
l = list()
for i in range(10):
    randint = random.randrange(50*2 - 1)
    bisect.insort(l, randint)
    print('%2d ->' % randint, l)