gevent + redis-py: SystemError: NULL result without error in PyObject_Call

Question

I am using redis-py with redish together with gevent and I have my own class EventBot which inherits from Greenlet. In the `__init__` method of this class I am initialising connection to redis using ``` self._redis = Client(serializer=serialization.JSON(), **self.REDIS_CONFIG) ``` Sometimes when I try to run the script, it throws `SystemError: NULL result without error in PyObject_Call` but sometimes it starts normally. I also tried moving the redis initialization to the `_run()` method, but it didn't helped. This is the simplified class I am using: ``` from gevent import monkey, Greenlet monkey.patch_all() from sleekxmpp import ClientXMPP from redish import serialization from redish.client import Client class EventBot(ClientXMPP, Greenlet): REDIS_CONFIG = { 'host': 'localhost', 'port': 6379, 'db': "" } def __init__(self, jid, password, redis_config=None): ClientXMPP.__init__(self, jid, password) Greenlet.__init__(self) # Redis init if redis_config is not None: self.REDIS_CONFIG.updat…

Accepted Answer

There seems to be a problem with `greenlet==0.4.0` when using `GCC 4.8`.

If you don't have older gcc or another compiler available, you can override the problem by using `CFLAGS="-O0" pip install greenlet==0.4.0` or by editing greenlet's `setup.py` and tweaking `os.environ["CFLAGS"]`.

Other solution may be to download and use the binary `greenlet.so`

gevent + redis-py: SystemError: NULL result without error in PyObject_Call

Solution

Problem