merge_ratios.py

import subprocess
import numpy as np

res = subprocess.check_output(['git', 'shortlog', '-s', '-n', '--merges',
                               '--first-parent', 'master',
                               '--since="1 year ago"'])
res = res.decode('utf-8').split('\n')
res = [r for r in res if r.strip()]

merges, authors = zip(*[r.split(maxsplit=1) for r in res])
merges = np.array(merges, dtype=int)
merges = merges / merges[0]

print("Merge ratios for the past year:\n")

for m, a in zip(merges, authors):
    if str(m)[:4] != '0.00':
        print(f'{m:.2f} {a}')