retry
Easy to use retry decorator.
Step side
It's fork: https://github.com/invl/retry
My changes had started from version 0.9.3 (see ChangeLog)
Features
- No external dependency (stdlib only).
- (Optionally) Preserve function signatures (pip install decorator).
- Original traceback, easy to debug.
Installation
$ pip install retry-shAPI
retry decorator
Various retrying logic can be achieved by combination of arguments.
Examples
from retry import retry
@retry()
def make_trouble():
'''Retry until succeed'''
@retry(ZeroDivisionError, tries=3, delay=2)
def make_trouble():
'''
Retry on ZeroDivisionError,
raise error after 3 attempts, sleep 2 seconds between attempts.
'''
@retry((ValueError, TypeError), delay=1, backoff=2)
def make_trouble():
'''
Retry on ValueError or TypeError,
sleep 1, 2, 4, 8, ... seconds between attempts.
'''
@retry((ValueError, TypeError), delay=1, backoff=2, max_delay=4)
def make_trouble():
'''
Retry on ValueError or TypeError,
sleep 1, 2, 4, 4, ... seconds between attempts.
'''
@retry(ValueError, delay=1, jitter=1)
def make_trouble():
'''
Retry on ValueError,
sleep 1, 2, 3, 4, ... seconds between attempts.
'''
# If you enable logging, you can get warnings like 'ValueError, retrying in
# 1 seconds'
if __name__ == '__main__':
import logging
logging.basicConfig()
make_trouble()retry_call
This is very similar to the decorator, except that it takes a function and its arguments as parameters. The use case behind it is to be able to dynamically adjust the retry arguments.
import requests
from retry.api import retry_call
def make_trouble(service, info=None):
if not info:
info = ''
r = requests.get(service + info)
return r.text
def what_is_my_ip(approach=None):
if approach == "optimistic":
tries = 1
elif approach == "conservative":
tries = 3
else:
# skeptical
tries = -1
result = retry_call(
make_trouble,
fargs=["http://ipinfo.io/"],
fkwargs={"info": "ip"},
tries=tries
)
print(result)
what_is_my_ip("conservative")