GitHub API authentication and rate limiting in Python

import httpx
import asyncio
from datetime import datetime

class GitHubClient:
    BASE_URL = 'https://api.github.com'

    def __init__(self, token: str):
        self.client = httpx.AsyncClient(
            base_url=self.BASE_URL,
            headers={
                'Authorization': f'Bearer {token}',
                'Accept': 'application/vnd.github.v3+json',
                'X-GitHub-Api-Version': '2022-11-28',
            },
            timeout=10.0,
        )

    async def _request(self, method: str, path: str, **kwargs) -> dict:
        response = await self.client.request(method, path, **kwargs)

        # Check rate limit
        remaining = int(response.headers.get('X-RateLimit-Remaining', 1))
        if remaining < 10:
            reset_at = int(response.headers.get('X-RateLimit-Reset', 0))
            wait = max(0, reset_at - datetime.utcnow().timestamp())
            print(f'Rate limit low ({remaining} remaining), waiting {wait:.0f}s')
            await asyncio.sleep(wait + 1)

        response.raise_for_status()
        return response.json()

    async def get_repo(self, owner: str, repo: str) -> dict:
        return await self._request('GET', f'/repos/{owner}/{repo}')

    async def list_prs(self, owner: str, repo: str, state: str = 'open') -> list[dict]:
        all_prs = []
        page = 1
        while True:
            data = await self._request(
                'GET', f'/repos/{owner}/{repo}/pulls',
                params={'state': state, 'per_page': 100, 'page': page}
            )
            if not data:
                break
            all_prs.extend(data)
            page += 1
        return all_prs

    async def close(self):
        await self.client.aclose()

# Usage
async def main():
    client = GitHubClient(token='ghp_...')
    try:
        repo = await client.get_repo('anthropics', 'anthropic-sdk-python')
        print(f"Stars: {repo['stargazers_count']}")
        prs = await client.list_prs('anthropics', 'anthropic-sdk-python')
        print(f"Open PRs: {len(prs)}")
    finally:
        await client.close()