接受 1 个可迭代参数并添加列表中的所有对象（如果它们是 int 或 float）的函数？

Question

I need to create a function that takes one iterable parameter and adds all of the objects in the list if they are an int or float. Objects that are not int or float should be skipped and a sum of int and float should be returned. I need to use loop and isinstance function. If there is an input [5.3, 2, "Book", True], return float object should equal to 7.3. So far I have:

def add_numbers_in_list(number_list):
    for x in number_list:
        try:
            yield float(x)
        except ValueError:
            pass
number_list = [5.3, 2, "Book", True]
print(sum(add_numbers_in_list(number_list)))

I'm getting 8.3 as an answer.

Answer 1

This is because float(True) equals 1 . To fix your code you can do this:

def add_numbers_in_list(number_list):
    for x in number_list:
       if type(x) in [float, int]: # Change over here
          yield float(x) 


number_list = [5.3, 2, "Book", True]
print(sum(add_numbers_in_list(number_list)))

If you would like to store the count and return it you can use the following script:

def add_numbers_in_list(number_list):
    count = 0
    for x in number_list:
       if type(x) in [float, int]:
          count += float(x) 
    return count


number_list = [5.3, 2, "Book", True]
print(add_numbers_in_list(number_list))