Get an error when I upgrade asyncpg from version 0.18.3 to 0.20.1

[sihcpro]

• asyncpg version: 0.20.1
• PostgreSQL version: 11.4 +
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: No
• Python version: Python 3.7.3
• Platform: Sanic
• Do you use pgbouncer?: No
• Did you install asyncpg with pip?: Yes
• If you built asyncpg locally, which version of Cython did you use?: No
• Can the issue be reproduced under both asyncio and
  uvloop?: I don't know, uvloop==0.13.0

My project import asyncpg only one place:

@app.listener("before_server_start")
async def register_db(app, loop):
    # Create a database connection pool
    app.config["pool"] = await create_pool(
        dsn=config.DB_DSN,
        min_size=10,  # in bytes,
        max_size=10,  # in bytes,
        max_queries=50000,
        max_inactive_connection_lifetime=300,
        loop=loop,
    )

But when server is initialing, I get this error:

RESOURCE [tag].
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 183, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 109, in _get_module_details
    __import__(pkg_name)
  File "/Users/sihc/Project/ssc/ssc-notification/src/ssc_notification/__init__.py", line 7, in <module>
    from .query import configure_notification_query
  File "/Users/sihc/Project/ssc/ssc-notification/src/ssc_notification/query/__init__.py", line 3, in <module>
    from asyncpg import create_pool
  File "/Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/__init__.py", line 8, in <module>
    from .connection import connect, Connection  # NOQA
  File "/Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/connection.py", line 19, in <module>
    from . import connect_utils
  File "/Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/connect_utils.py", line 27, in <module>
    from . import protocol
  File "/Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/protocol/__init__.py", line 8, in <module>
    from .protocol import Protocol, Record, NO_TIMEOUT  # NOQA
  File "asyncpg/protocol/protocol.pyx", line 1, in init asyncpg.protocol.protocol
ImportError: dlopen(/Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/pgproto/pgproto.cpython-37m-darwin.so, 2): Symbol not found: _uuid_to_hex
  Referenced from: /Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/pgproto/pgproto.cpython-37m-darwin.so
  Expected in: flat namespace
 in /Users/sihc/.virtualenvs/ssc/lib/python3.7/site-packages/asyncpg/pgproto/pgproto.cpython-37m-darwin.so

Can you help me?

[elprans]

Which version of macOS are you on? I cannot reproduce this on Catalina.

[sihcpro]

My MAC version is: Sierra 10.12.6 (16G29)

[joshmeek]

I am also encountering the same error when using asyncpg==0.20.1. Downgrading fixes the issue.

System information:
platform: Darwin-16.7.0-x86_64-i386-64bit
MacOS Version: 10.12.6 Sierra
Python version: 3.7.3

[elprans]

Fixed in #566.