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Pythonパッケージのライセンス情報をCSVに出力する

2022/06/28に公開約23,900字

目的

Pythonパッケージの以下の情報をCSVに出力する方法を検討する

  • パッケージ名
  • バージョン
  • ホームページ
  • ライセンス

実験環境

  • MacOS
  • python3.9

パッケージ一覧の取得方法

pipコマンドでインストールしたパッケージの一覧は下記のファイルで取得可能

pip list

https://pip.pypa.io/en/stable/cli/pip_list/

ライセンス情報は出力されない模様

パッケージの詳細情報の取得方法

pip showコマンドで個別のパッケージの詳細情報を表示できる。

%pip show requests
Name: requests
Version: 2.26.0
Summary: Python HTTP for Humans.
Home-page: https://requests.readthedocs.io
Author: Kenneth Reitz
Author-email: me@kennethreitz.org
License: Apache 2.0
Location: /usr/local/lib/python3.9/site-packages
Requires: certifi, charset-normalizer, idna, urllib3
Required-by: bert-score, folium, gdown, google-api-core, googlemaps, huggingface-hub, jupyterlab-server, pystac-client, transformers

https://pip.pypa.io/en/stable/cli/pip_show/

ライセンス情報は出力されるが、パッケージを個別に指定する必要がある

pypiに登録されている情報をJSONで取得する方法

pypiに登録されている情報は以下の形式でJSON形式として取得できる。

https://pypi.org/pypi/パッケージ名/バージョン/json

例: awslogs 0.14.0の情報

https://pypi.org/pypi/awslogs/0.14.0/json

jsonの内容
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	"info": {
		"author": "Jorge Bastida",
		"author_email": "me@jorgebastida.com",
		"bugtrack_url": null,
		"classifiers": [
			"Development Status :: 4 - Beta",
			"Environment :: Web Environment",
			"Intended Audience :: Developers",
			"License :: OSI Approved :: BSD License",
			"Operating System :: OS Independent",
			"Programming Language :: Python :: 3",
			"Programming Language :: Python :: 3.5",
			"Programming Language :: Python :: 3.6",
			"Programming Language :: Python :: 3.7",
			"Programming Language :: Python :: 3.8",
			"Topic :: Utilities"
		],
		"description": "awslogs is a simple command line tool to read aws cloudwatch logs.\n\n\n",
		"description_content_type": "",
		"docs_url": null,
		"download_url": "",
		"downloads": {
			"last_day": -1,
			"last_month": -1,
			"last_week": -1
		},
		"home_page": "https://github.com/jorgebastida/awslogs",
		"keywords": "aws logs cloudwatch",
		"license": "BSD",
		"maintainer": "",
		"maintainer_email": "",
		"name": "awslogs",
		"package_url": "https://pypi.org/project/awslogs/",
		"platform": "any",
		"project_url": "https://pypi.org/project/awslogs/",
		"project_urls": {
			"Homepage": "https://github.com/jorgebastida/awslogs"
		},
		"release_url": "https://pypi.org/project/awslogs/0.14.0/",
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			"termcolor (>=1.1.0)",
			"python-dateutil (>=2.4.0)"
		],
		"requires_python": ">=3.5.*",
		"summary": "awslogs is a simple command line tool to read aws cloudwatch logs.",
		"version": "0.14.0",
		"yanked": false,
		"yanked_reason": null
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	"last_serial": 7672661,
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ライセンスを調べるツールを導入する方法

以下のツールをインストールすることでライセンス情報を調べることが可能

https://pypi.org/project/pip-licenses/
$pip install -U pip-licenses 
$pip-licenses

以下のコードでローカルのパッケージの情報を抽出している模様。

https://github.com/raimon49/pip-licenses/blob/master/piplicenses.py#L48

自力でパッケージ情報をCSVに出力するコード例

ローカルのパッケージあるいはPipfile.lockに記載されたパッケージの情報をCSVに出力するコード例


import subprocess
import requests
import sys
import csv
import argparse
import json


def find_classifiers(classifiers, key):
    for item in classifiers:
        if key in item:
            return item
    return None


def get_pypi(module_name, version):
    res = requests.get(f'https://pypi.org/pypi/{module_name}/{version}/json')
    if res.status_code != 200:
        print(
            f'not found {module_name}/{version} in pypi.org',
            file=sys.stderr
        )
        return {
            'home_page': '',
            'license': ''
        }
    data = res.json()
    classifiers = data['info']['classifiers']
    home_page = data['info']['home_page']
    if not home_page:
        home_page = data['info']['project_url']
    license = data['info']['license']
    if not license:
        license = find_classifiers(classifiers, 'License')
    return {
        'home_page': home_page,
        'license': license
    }


def analyze_local(pipcmd):
    process = subprocess.run([pipcmd, 'list', '--format=json'], capture_output=True)
    output = process.stdout.decode('utf-8')
    lines = json.loads(output)
    for item in lines:
        yield {
            'module_name': item['name'],
            'version': item['version']
        }


def analyze_pipfile_lock(pipfile_lock_path):
    with open(pipfile_lock_path, 'r', encoding='utf-8') as fr:
        lock_data = json.load(fr)
        for key in lock_data.keys():
            if key == '_meta':
                continue
            for module_name in lock_data[key].keys():
                version = lock_data[key][module_name]['version'][2:]
                yield {
                    'module_name': module_name,
                    'version': version
                }


parser = argparse.ArgumentParser(description="pythonのライブラリ情報をCSVに出力する")
parser.add_argument("output_path", type=str, help="出力CSVパス")
parser.add_argument(
    "--pip_cmd", type=str, default="pip", help="pipコマンド名"
)
parser.add_argument(
    "--pipfile_lock_path", type=str, default="", help="解析対象のPipfile.lockのパス"
)
args = parser.parse_args()

with open(args.output_path, "w", encoding="utf-8", errors="ignore") as fw:
    writer = csv.writer(fw, quoting=csv.QUOTE_ALL)
    if args.pipfile_lock_path:
        items = analyze_pipfile_lock(args.pipfile_lock_path)
    else:
        items = analyze_local(args.pip_cmd)
    for item in items:
        module_name = item['module_name']
        version = item['version']
        data = get_pypi(module_name, version)
        writer.writerow([
            module_name,
            version,
            data['home_page'],
            data['license']
        ])


実行方法

ローカルのパッケージ情報をoutput.csvに出力する

python3 check_local.py output.csv

指定のPipfile.lock中のパッケージ情報をoutput2.csvに出力する

python3 check_local.py output2.csv --pipfile_lock_path="hogehoge/Pipfile.lock"

Discussion

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