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Safety belt for your Python distributed services.

Project description

Safepy (rhymes with safety) is a latency and fault tolerance library for Python 3.5 (or greater) inspired by Hystrix, Cloud Design Patterns, AWS Architecture Blog and many others.

How to use the library

You can either use the mechanisms as decorators:

from safety import retry

class ProfileService(object):
    @retry(attempts=3, base_delay=1)
    async def get_profile(self, username):

Or to dynamically recreate protected methods:

from safety import retry

class ProfileService(object):
    def __init__(self):
        self.get_profile = retry(attempts=3, base_delay=1)(

    async def get_profile(self, username):


from safepy import retry

class ServiceA(object):
    @retry(attempts=3, base_delay=1)
    async def call():


  • The default retry is an alias for retry_with_jitter_backoff, a retry mechanism which uses jitter backoff. For exponential backoff use retry_with_exponential_backoff.

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