if hasattr(obj, 'attribute'): # do somthing vs try: # access obj.attribute except AttributeError, e: # deal with AttributeError Which should be preferred and why?

I have a dictionary that sometimes receives calls for non-existent keys, so I try and use hasattr and getattr to handle these cases: key_string = 'foo' print "current info:", info print hasattr(in...

Given the following class (with a buggy property) then what is the best foolproof way of checking that the bar property exists? class Foo(object): @property def bar(self): raise AttributeError(...

Why does hasattr say that the instance doesn't have a foo attribute? >>> class A(object): ... @property ... def foo(self): ... ErrorErrorError ... >>> a = A() >>> hasat...

I have a class that implements virtual attributes using __getattr__. The attributes can be expensive, e.g. performing a query. Now, I am using a library which checks if my object has the attribute ...

hasattr documentation says that it takes an object and an attribute name and lets you know if that attribute exists on that object. I have discovered that it seems to work on class names too (i.e....

if hasattr(form, 'name') and hasattr(form, 'date'): print(form.name) #'Some name' - True print(form.date) #none - False This condition validates as True even if the hasattr(form, 'date') is fal...

I regularly want to check if an object has a member or not. An example is the creation of a singleton in a function. For that purpose, you can use hasattr like this: class Foo(object): @classmeth...