How to check whether a method exists in Python?

Question

In the function __getattr__(), if a referred variable is not found then it gives an error. How can I check to see if a variable or method exists as part of an objec

Answer 1

Check if class has such method?

hasattr(Dynamo, key) and callable(getattr(Dynamo, key))

or

hasattr(Dynamo, 'mymethod') and callable(getattr(Dynamo, 'mymethod'))

You can use self.__class__ instead of Dynamo

Answer 2

Maybe like this, assuming all method is callable

app = App(root) # some object call app 
att = dir(app) #get attr of the object att  #['doc', 'init', 'module', 'button', 'hi_there', 'say_hi']

for i in att: 
    if callable(getattr(app, i)): 
        print 'callable:', i 
    else: 
        print 'not callable:', i

Answer 3

You can try using 'inspect' module:

import inspect
def is_method(obj, name):
    return hasattr(obj, name) and inspect.ismethod(getattr(obj, name))

is_method(dyn, 'mymethod')