Question

这是我的代码，我希望它能够通过并选择适合的类别，但它总是给我F。

import random

def rand(start, stop):
  print random.randint(start,stop)

def grader(rand):
  print "Your test score is "
  x = rand(50, 100)
  if x >= 90:
    print "which is an A."
  elif x <= 89 and x >= 80:
    print "which is a B."
  elif x <= 79 and x >= 70:
    print "which is a C."
  elif x <= 69 and x >=60:
    print "which is a D."
  else:
    print "which is a F."

Answer 1

而不是返回random.randint(start,stop)，而是打印它。

更改

def rand(start, stop):
  print random.randint(start,stop)

到

def rand(start, stop):
  return random.randint(start,stop)

Answer 2

您的rand函数正在返回None，因为它正在打印一个值，而不是返回它。此外，良好的做法是将其命名为更具描述性的内容，例如get_random或get_random_number。此外，您的get_random函数与randint完全相同，但我会在那里给您带来疑问（要添加更多功能？）

作为奖励，我已经列举了一个例子，这个鲜为人知的bisect库如何适用于这些价值交叉问题！

示例：

import bisect, random def get_random(start, stop): return random.randint(start,stop) def match_grade(score): breakpoints = [60, 70, 80, 90] grades = ["which is a F.", "which is a D.", "which is a C.", "which is a B.", "which is an A."] bisect_index = bisect.bisect(breakpoints, score) return grades[bisect_index] random_number = get_random(50, 100) grade_range = match_grade(random_number) print "Your test score is {}, {}".format(random_number, grade_range)

示例输出：

Your test score is 63, which is a D.

为什么我的if语句不适用于此评分代码？

2 个答案: