分数到成绩的对应

grades.py

import bisect


def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'):
    i = bisect.bisect(breakpoints, score)
    return grades[i]


if __name__ == '__main__':
    grades = [grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]
    print(grades)
    # ['F', 'A', 'C', 'C', 'B', 'A', 'A']