Python3中的Binning值

Question

说我有以下txt文件

Distances    Counts
1             5
2             5 
3             9
4             10
9             10
10            10
11            5
14            5
20            1
21            1
23            2

我想根据第一列进行分箱并将第二列相加。 如果使用bin为5的正确输出将是

0-5     29
5-10    20
10-15   10
15-20   20
20-25   3

或只是

5       29
10      20
15      10
20      20
25      3

我试过

binfile = open('distances.txt', 'r')
binsize = 5
summar = 0
binsize2 = binsize
for line in binfile:
    line = line.strip().split('\t')
    distance = int(line[0])
    counts = int(line[1])
    if distance <= binsize2:
        summar += counts
    else:
        print(str(binsize2)+'\t'+str(summar))
        binsize2 = binsize2 + binsize
        summar = counts

但它不打印最后一个bin。有什么建议吗？