Question

所以我正在制作一个总计第一学期成绩的课程，第二学期也会这样做。这就是我所拥有的，它非常简单......

a = raw_input('1st Quarter: ')
b = raw_input('2nd Quarter: ')
c = raw_input('Midterm: ')
d = a * 0.4
e = b * 0.4
f = c * 0.2
g = a + b + c
print 'Your semester grade is', g

我想知道是否有一段代码我可以接受变量g并将其从数字更改为变量，或者在这种情况下它将是一个等级，如A，B， C，D或F.我以为我能做到

if g in [90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
    print 'your grade is A'

我会为B-F做更多事情但是这不起作用。我已经调查了一下，找不到它，我找到了什么没有帮助或者不对！

Answer 1

使用bisect函数查看非常相似的示例here：

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

因此，在Python3中，您可以执行以下操作：

import bisect

GRADES = 'FDCBA'
GRADE_THRESHOLDS = (60, 70, 80, 90)


def grade(score):
    i = bisect.bisect(GRADE_THRESHOLDS, score)
    return GRADES[i]


if __name__ == '__main__':
    a = int(input('1st Quarter: '))
    b = int(input('2nd Quarter: '))
    c = int(input('Midterm: '))
    weighted = a * 0.4 + b * 0.4 + c * 0.2
    final_grade = grade(weighted)
    print('Your semester grade is', final_grade)

当然，您需要使用对您的评分方案有意义的值替换阈值元组。

Answer 2

以下程序演示了如何在Python中将整数值转换为字母等级：

import math
import sys


def main():
    weights = (('1st Quarter', 2), ('2nd Quarter', 2), ('Midterm', 1),
               ('3rd Quarter', 3), ('4th Quarter', 3), ('Final', 4))
    weighted_score = get_weighted_score(weights)
    min_grade_scores = dict(A=90, B=80, C=70, D=60, F=0)
    grade = pick_grade(weighted_score, min_grade_scores)
    print('Your semester grade is', grade)


def get_weighted_score(weights):
    total_score = total_weight = 0
    for name, weight in weights:
        score = get_integer(name + ': ', 0, 100)
        total_score += score * weight
        total_weight += weight
    return round(total_score / total_weight)


def get_integer(prompt, min_value=-math.inf, max_value=math.inf):
    while True:
        try:
            value = input(prompt)
        except EOFError:
            sys.exit()
        else:
            if not value:
                print('Please provide a value')
                continue
            try:
                number = int(value)
            except ValueError:
                print('Please provide a number')
            else:
                if number < min_value:
                    print('Number may not be lower than', min_value)
                    continue
                if number > max_value:
                    print('Number may not be higher than', max_value)
                    continue
                return number


def pick_grade(weighted_score, min_grade_scores):
    pairs = map(lambda pair: pair[::-1], min_grade_scores.items())
    for score, grade in sorted(pairs, reverse=True):
        if weighted_score >= score:
            return grade
    raise ValueError('Valid grade could not be found')

if __name__ == '__main__':
    main()

特别是，您需要查看pick_grade函数以了解算法的工作原理。

如何将整数值更改为字母python

2 个答案: