sum and count columns from stdin, because I'm no good at awk

sum.py

import sys

d = {}

for line in sys.stdin:
    adds, dels, path = line.rstrip().split('\t')
    if path in d:
        d[path]['adds'] += int(adds)
        d[path]['dels'] += int(dels)
        d[path]['count'] += 1
    else:
        d[path] = {'adds': int(adds), 'dels': int(dels), 'count': 1}

for path, vals in d.items():
    sys.stdout.write(f"{vals['count']}\t{vals['adds']}\t{vals['dels']}\t{path}\n")