subclass of obspy.core.event.magnitude.Magnitude object (or other event object)

Users Mailing List Archive
1

Dear obspy users,

I’m working on some magnitude estimates and I would like do create a subclass inheriting from “magnitude.Magnitude” obspy object. At this point I just want to have the same attributes as the parent class plus some very simple new attributes such as “corner frequency”, “omega_0”…

I just did the following:

class Magnitude_User(_Magnitude):
def init(self,*args, **kwargs):

initialization code

self.fc=kwargs.get(‘fc’)
with warnings.catch_warnings():
warnings.simplefilter(“ignore”)
super().init(*args, **kwargs)

I wanted to get rid of the warning, but I still get the following:

UserWarning: Setting attribute “fc” which is not a default attribute

What would you advise for defining a new attribute for an obspy class without directly modifying the parent class? Is that the best approach? If yes, how can I get rid of the “warnings.warn”?

I thought about using the AttribDict() and the “extra” attribute but I’m not really interested in writing any xml for now and I would prefer a more direct approach.

Thanks for your help,

Christian

2

Hey Christian,

most event classes are autogenerated and contain some “magic” to make handling them easier. One of these things is to warn on setting unknown attributes (this would otherwise a great source of unspotted errors due to typos).

There are two ways around this - either turn off warning with non-default keys or add it as a default key. Also best inherit from Magnitude instead of _Magnitude.

from obspy.core.event import Magnitude

class Magnitude_User(Magnitude):

Either do this.

warn_on_non_default_key = False
def init(self, fc, *args, **kwargs):
super().init(*args, **kwargs)

Or add it as a default value.

self.defaults[‘fc’] = None
self.fc = fc

Cheers!

Lion

3

Thanks a lot Lion, it’s great to have a defaults option, I’ll use this one in my case! Perfect!

Cheers,

Ch.