file_changes_over_time.py

import commands
import json

output_name = "commits-over-time"

data = []
past_changes = {}
commits = commands.getstatusoutput(
    "git rev-list --all master")[1].split('\n')

for commit in commits:
    commands.getstatusoutput("git checkout %s" % commit)
    timestamp = commands.getstatusoutput("git show -s --format=%ct")[1]
    file_changes = commands.getstatusoutput(
        "find . -name '*.py' | xargs wc -l")[1].split('\n')
    changes = {}
    for _file in file_changes:
        if 'total' in _file or len(_file) == 0:
            continue
        count, filename = _file.strip().split(' ./')
        changes[filename] = int(count)
    if changes:
        if past_changes != changes:
            data.append({
                'id': commit,
                'timestamp': int(timestamp),
                'files': changes
            })
            past_changes = changes

commands.getstatusoutput("git checkout master")

with open("%s.json" % output_name, 'w') as outfile:
    json.dump(data, outfile)