Give you a github style diffstats, with the ability to exclude paths for more relevancy.

better_diff_stats.py

from __future__ import print_function

import sys

# Gives you a github style diffstats.
# With the ability to exclude paths for more relevancy.
#
# Generate a diffstat file with:
# git diff --numstat master...HEAD > stats.diff
#
# Run this scipt
# python better_diff_stats.py stats.diff

EXCLUDE_PATHS = [
    'project/static/libs',  # example path
]


def calc_stats():
    diff_filename = sys.argv[1]
    diff_file = open(diff_filename, 'r')
    total_adds = 0
    total_dels = 0
    num_files = 0

    for line in diff_file:
        num_adds, num_dels, filename = line.split('\t')

        if (num_adds == '-'
           or num_dels == '-'
           or any(map(filename.startswith, EXCLUDE_PATHS))):
            continue

        num_adds = int(num_adds)
        num_dels = int(num_dels) * -1

        num_files += 1
        total_adds += int(num_adds)
        total_dels += int(num_dels)

        print('{:+}\t{:+}\t{}'.format(num_adds, num_dels, filename), end='')

    print('')
    print('Showing {} changed files with {:,} additions and {:,} deletions.'.format(num_files, total_adds, total_dels))
    print('Resulting in a net difference of {:+,} lines.'.format(total_adds + total_dels))

if __name__ == '__main__':
    calc_stats()