在计算大于和小于列表中某些值的值的数量时会跳过一些数字

Question

I'm having problems with counting the number of values greater than start (initially 0) and less than end (initially 10) certain values in a list.

The list contains 12 500 float numbers from the range 0 - 110. I want to count how many numbers out of the list are in the range 0-10, then 10-20, 20-30, (...), 100-110

I have implemented a for loop with a list comprehension inside like that:

all_nums = [] # contains 12_500 float numbers

nums_counted = []
start = 0
end = 10
for x in range(11):
    count = len([x for x in to_int if start < x < end])
    nums_counted.append(count)
    start = start + 10
    end = end + 10

The problem is len(all_nums) = 12500 and sum(nums_counted) = 12492 , which should be equal to 12 500 as well.

I do not know what am I doing wrong and where those 8 numbers disappear

Answer 1

You can just do int division by 10

> from collections import Counter
> 
> l = [0.0, 0.1, 6.1, 11.4, 19.2, 20.9, 40.1]
> 
> d = Counter()
> 
> for val in l:
>     binn = val//10
>     d[binn] += 1
> 
> print(l) 
> print(d.items())
[0.0, 0.1, 6.1, 11.4, 19.2, 20.9, 40.1]
dict_items([(0.0, 3), (1.0, 2), (2.0, 1), (4.0, 1)])

In this case 0.0 --> 0-10 range which has 3 count