為什么這個簡單的程式練習沒有回傳False？-有解無憂

撰寫一個函式is_better_than_avg(students, pos)，它接受兩個引數students是所有學生詞典的串列 position 是一個整數 - 我們要檢查的學生在串列中的位置。檢查的作業原理是這樣的 - 計算學校所有成績的平均值（上部單元格），將值與學生的平均值進行比較。回傳True如果學生的平均大于學校平均，否則，回傳False。

我不知道為什么程式的第二次執行顯示True而不是False.

# Function for testing purposes
def test(got, expected):
  if got == expected:
    prefix = ' OK '
  else:
    prefix = "  Something's wrong  "
  print(prefix,' got:',repr(got),'expected:',repr(expected))
list_of_students = []
list_of_students.append(kosma) # appending the student k1sma

def is_passed(student_dict):
  return avg(student_dict)>=3.0
  
def school_avg(students):
  all = 0
  licznik = 0
  for a in students:
    all = all   avg(a)  #dodaje ?redni? sprawdzanego studenta do 'all'
    licznik = licznik   1 #dodaje 1 do liczniku

  return all / licznik

list_of_students.append({
    "username": "mikub",
    "age":24,
    "is_blocked": False,
    "grades": [5,5,5,5]
})

list_of_students.append({
    "username": "ewa",
    "age":24,
    "is_blocked": False,
    "grades": [1,3,3,2,1,1,1,1,1,1]
})

list_of_students.append({
    "username": "robert",
    "age":24,
    "is_blocked": False,
    "grades": [5,5,5,5,5,1]
})
list_of_students.append({
    "username": "radek",
    "age":24,
    "is_blocked": False,
    "grades": [1,3,3,2,5,5,5]
})

list_of_students.append({
    "username": "kasia",
    "age":24,
    "is_blocked": False,
    "grades": [5,5,5,1]
})

list_of_students.append({
    "username": "kasia",
    "age":24,
    "is_blocked": False,
    "grades": [5,1,1,1,1,5,1]
})
list_of_students.append({
    "username": "jola",
    "age":24,
    "is_blocked": False,
    "grades": [5,4,5,5,5,4]
})

#this is the important part

def is_better_than_avg(students,pos):
  for pos in students:
    if avg(pos) > school_avg(students):
      return True
    elif avg(pos) < school_avg(students):
      return False

test(is_better_than_avg(list_of_students,0),True) #returns True as it should
test(is_better_than_avg(list_of_students,6),False) #idk why this returns True as well

uj5u.com熱心網友回復：

我認為你應該is_better_than_avg 像這樣改變函式：

def is_better_than_avg(students,pos):
    student = students[pos]
    if avg(student) > school_avg(students):
        return True
    elif avg(student) < school_avg(students):
        return False

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標籤：Python 字典 for循环 if 语句

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