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When an attribute is not found object.__getattr__ is called. Is there an equivalent way to intercept undefined methods?
773
Okay, so it's cool that you can use getattr to get methods as well as propertiespropertiesA property, in some object-oriented programming languages, is a special sort of class member, intermediate in functionality between a field (or data member) and a method.https://en.wikipedia.org › wiki › Property_(programming)Property (programming) - Wikipedia, but how does that help us? Well, this can definitely be useful in keeping your code DRY if you have some common logic surrounding branching method calls.
Python getattr() function is used to get the value of an object's attribute and if no attribute of that object is found, default value is returned.
Python getattr() function is used to access the attribute value of an object and also gives an option of executing the default value in case of unavailability of the key. Parameters : obj : The object whose attributes need to be processed. key : The attribute of object.
__getattribute__ has a default implementation, but __getattr__ does not. This has a clear meaning: since __getattribute__ has a default implementation, while __getattr__ not, clearly python encourages users to implement __getattr__ .
There is no difference. A method is also an attribute. (If you want the method to have an implicit "self" argument, though, you'll have to do some more work to "bind" the method).
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Methods are attributes too. __getattr__ works the same for them:
class A(object):
def __getattr__(self, attr):
print attr
Then try:
>>> a = A()
>>> a.thing
thing
>>> a.thing()
thing
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
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