Python:函数在调用

时间:2017-02-03 15:15:11

标签: python function

以下是已输入分数的3名学生名单的代码,我想计算个人和班级平均分。平均函数为各个学生返回正确的值,但get_class_average函数不返回正确的值。这是python中的codecademy课程,在线编译器显示以下错误: 哎呀,再试一次。 get_class_average([alice])按预期返回83.8666666667而不是91.15。  有什么问题?没有语法错误。

lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
 }
 alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
 }
 tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}

# Add your function below!
def average(numbers):
  total = sum(numbers)
  total = float(total)
  return total/len(numbers)

def get_average(student):
  homework = average(student["homework"])
  quizzes = average(student["quizzes"])
  tests = average(student["tests"])
  s = 0.1*homework + 0.3*quizzes + 0.6*tests
  return s
def get_letter_grade(score):
  if score>=90:
     return "A"
  elif score>=80:
     return "B"
  elif score>=70:
     return "C"
  elif score>=60:
     return "D"
  else:
     return "F"
  print get_letter_grade(get_average(lloyd))
def get_class_average(students):
  results = []
  results.append(get_average(lloyd))
  results.append(get_average(alice))
  results.append(get_average(tyler))
  return(average(results))

2 个答案:

答案 0 :(得分:1)

您忘记了打印或返回:

def get_class_average(students):
  results = []
  results.append(get_average(lloyd))
  results.append(get_average(alice))
  results.append(get_average(tyler))
  print average(results)

OR

def get_class_average(students):
  results = []
  results.append(get_average(lloyd))
  results.append(get_average(alice))
  results.append(get_average(tyler))
  return average(results)

没有打印,它不会打印结果。没有返回,它不会返回结果。

答案 1 :(得分:0)

这里有两个错误:

首先,在函数return的末尾需要get_class_average()。这就是函数无法正确返回的原因。

其次,函数get_class_average()接受参数students。但是,似乎students没有使用它。