Dealing with some unstable code? Be it a bad connection or a system that often falls over, retrace is here to help. Simple, easy, elegant and configurable method retrying with a nice clean API.
Don't manually fudge around with exception retrying again!
Retrace supports Python 2.7 and 3.3+.
Installation from pip is simple, like so:
If you don't want to add a new dependency for such a small tool, you are in luck! Retrace is
designed to be easily vendor-able!
Simply head to the
, grab the
file and include it in your project tree. Then, for example, say you add it under
then you just need to use that import path in the examples below.
If you choose to vendor retrace, you will need to manually version it yourself. We recommend that you pick the latest git tag to get the most recent stable version.
If you want to retry a function call on any exception you can use the decorator with no arguments. By default this will retry 5 times.By default this will retry 5 times.
By default this will catch all subclasses of Exception, meaning it wont catch a anything that subclasses BaseException directly like KeyboardInterupt.
Retry when an IOError is raised or any subclasses of it.
If you want to delay between retries you can pass in a number which is equal to the number of seconds to delay between retrying. For example, wait a second between attempts
By default retrace will retry 5 times , if you want to change that, pass in a new limit.5 times
Here is a neat trick - if you want to delay between each try, and have that increase with each attempt you can pass
in as your interval function! This will mean after the first attempt it will sleep for one second, then two seconds, three seconds etc.
This works because you can use
functions as the delay
, they must accept one argument which is the current retry number. So with
, the code sleeps for a the number of seconds equal to the attempt number.
Sometimes you will have functions that don't error, but return bad values or you might need to call it until you get a good value. You can achieve this with validators.
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