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kandi X-RAY | eev.ee Summary
kandi X-RAY | eev.ee Summary
This is the source for my blog, which you can find at The bulk of it consists of Markdown-formatted posts in content/, but perhaps you'll find the theme interesting too. It's powered by Pelican, a Python static blog system. Feel free to send pull requests for typos or factual errors or whathaveyou.
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QUESTION
TL;DR: how to use type(self)
in the decorator of a member function?
I would like to do serialization of derived classes and share some serialization logic in the base class in Python.
Since pickle
and simple yaml
did not seem to be able to deal with this reliably, I then stumbled over camel
which I consider a quite neat solution to the problem see this link.
Consider two extremely simplified classes B
and A
where B
is inheriting from A
. I want to be able to serialize B
in my main function like this:
ANSWER
Answered 2018-Oct-20 at 11:21Your version 3 is not going to work because, as you probably noticed, at the
time the decorator is called, A
is not defined yet.
If you would write your decorator
in the way before the @
syntactic sugar was added to Python:
QUESTION
While converting from python 2.x -> python 3.x, I found this change in the behavior of the built-in max
function. I didn't find it documented in any of the standard locations for migration issues.
https://eev.ee/blog/2016/07/31/python-faq-how-do-i-port-to-python-3/
http://python-future.org/compatible_idioms.html
How do I fix this?
Python 2.x:
...ANSWER
Answered 2017-Dec-04 at 06:22Answering my own question: there is no backwards compatible max
, but it is arguable that trying to find the max of None
doesn't really make sense.
The entries that I was comparing were timestamps, and I knew that they would never be negative. So I changed my code to return 0
instead of None
, so the max
turned to max([0,0,0])
which worked.
If you can't make such guarantees about your data, you could return -sys.maxsize
instead.
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