什么不能分配给函数调用是什么意思（python）
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What does can't assign to function call mean (python)
提问by Dorian Dore
I have recently started learning Python, and I have been assigned the task of creating a function that averages grades in a dictionary.
我最近开始学习 Python，我被分配了创建一个函数来平均字典中的成绩的任务。
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]
}
def average(grades):
total = 0
grades.sum() = total
total.float() = total
total = total / len(grades)
return total
However, when the function is executed, I receive the error, "Can't assign to function call" What does this mean, and how do I fix it?
但是，当函数执行时，我收到错误，“无法分配给函数调用”这是什么意思，我该如何解决？
回答by Sailesh Kotha
You are assigning a value to the return value of inbuilt function which is not possible..Try this
您正在为内置函数的返回值分配一个值，这是不可能的..试试这个
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]
}
def average(grades):
total = 0
total = grades.sum()
total = total.float()
total = total / len(grades)
return total
回答by Jivan
Instead of this:
取而代之的是：
grades.sum() = total
You'd rather do that:
你宁愿这样做：
total = grades.sum()
If you want to dig deeper, here is an explanation of the whys and hows.
回答by PM 2Ring
I'm guessing that you want to pass a list of grades to your average()function.
我猜您想将成绩列表传递给您的average()函数。
You have the syntax a bit mixed up in grades.sum() = totaland total.float() = total
你的语法有点混乱grades.sum() = total和total.float() = total
You (probably) want something like this:
你（可能）想要这样的东西：
def average(grades):
total = sum(grades)
return float(total) / len(grades)
And you'd call that function like this:
你会像这样调用这个函数：
avg = average(alice["homework"])
total = sum(grades)says calculate the sum of the values in gradesand store the result in a variable named total. The function call sum(grades)asks a question, and in Python (like most other programming languages) we write the question on the rightside of the =sign, and the place to put the answer goes on the leftside of the =sign. But your code has that backwards.
total = sum(grades)说计算中值的总和grades并将结果存储在名为 的变量中total。函数调用sum(grades)提出一个问题，在 Python（与大多数其他编程语言一样）中，我们将问题写在符号的右侧=，而放置答案的位置在=符号的左侧。但是你的代码倒退了。
