A fast PostgreSQL Database Client Library for Python/asyncio
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Latest commit ff68ca5 Jan 5, 2017 @elprans elprans Fix date/datetime negative infinity decoder regression
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Fixes: #62

README.rst

asyncpg -- A fast PostgreSQL Database Client Library for Python/asyncio

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asyncpg is a database interface library designed specifically for PostgreSQL and Python/asyncio. asyncpg is an efficient, clean implementation of PostgreSQL server binary protocol for use with Python's asyncio framework. You can read more about asyncpg in an introductory blog post.

asyncpg requires Python 3.5 or later and is supported for PostgreSQL versions 9.1 to 9.6.

Documentation

The project documentation can be found here.

Performance

In our testing asyncpg is, on average, 3x faster than psycopg2 (and its asyncio variant -- aiopg).

performance.png

The above results are a geometric mean of benchmarks obtained with PostgreSQL client driver benchmarking toolbench.

Features

asyncpg implements PostgreSQL server protocol natively and exposes its features directly, as opposed to hiding them behind a generic facade like DB-API.

This enables asyncpg to have easy-to-use support for:

  • prepared statements
  • scrollable cursors
  • partial iteration on query results
  • automatic encoding and decoding of composite types, arrays, and any combination of those
  • straightforward support for custom data types

Installation

asyncpg is available on PyPI and has no dependencies. Use pip to install:

$ pip install asyncpg

Basic Usage

import asyncio
import asyncpg

async def run():
    conn = await asyncpg.connect(user='user', password='password',
                                 database='database', host='127.0.0.1')
    values = await conn.fetch('''SELECT * FROM mytable''')
    await conn.close()

loop = asyncio.get_event_loop()
loop.run_until_complete(run())

License

asyncpg is developed and distributed under the Apache 2.0 license.