如何在 python 的输入周围放置方括号？

Question

I'm new to python and my professor gave us the assignment to write different functions. Writing the function is easy but he gave us examples of what the output should be and it kind of threw me off.

>>> average([])
0.0
>>> average([1.0])
1.0
>>> average([5.0, 10.0, 20.0])
11.666666666666666

This was the example. How can I place square brackets around my input like that?

Answer 1

Square parenthesis in python signify that your function is taking in an list as one of it's arguments.

You would take multiple inputs and append them to a list, which later you would input in the function.

Therefore your code will look like this:

def average(listOfNumbers):
    total = sum(listOfNumbers)
    return float(total)/len(listOfNumbers)

numOfInputs = int(input("Number of inputs: "))
numbers = []
for i in range(numOfInputs):
    numbers.append(int(input("Enter Number: ")))
print(average(numbers))

Answer 2

That means that your function has to take a list as an input. Therefore, you should assume your function is like below:

      def average(input): 
          # input looks like [0,5,6]

I hope this helps.

Answer 3

def average(inputlist)
    return sum(inputlist)/len(inputlist)

If you do this

average([2, 4, 5])

The function will know you are passing a list parameter since python is a dynamically typed language, that is - the type of the parameter inputlist will be determined at runtime.

Alternatively, you could just define your list first, then pass it to the function like this.

inputValues = [2, 4, 5]
average(inputValues) 

Answer 4

Create a list and then append your inputs to the list and then apply the function Try this code:

nums = []
n = int(input())
for i in range(n):
    nums.append(int(input()))
average(nums)

This above code will take an input n and then it takes n input numbers and then applies the average (any mathematical function).

Answer 5

def average(*args):
    for i in args:
        return sum(i)/len(i)
    
print(average([42,67,23,89]))