Python Programming with the Java™ Class Libraries: A Tutorial for Building Web and Enterprise Applications with Jython

Type Checking: callable(), type()

The callable(object) function returns true if the object can be called like a function. Since more than object types can be callable (lambdas, functions, methods, class instances, etc.), this feature is very useful. Here's an example:

>>> callable(dir)
1

This is nice, but how do you use it? Let's say that you want to find out which objects in the current module are callable.

Define a class whose instances are callable.

>>> class myclass:
...   def __call__(self):
...          return "hello"
...

Define an instance of the callable class.

>>> hello = myclass()

Define some not so useful functions.

>>> def func():pass
...
>>> def func1():pass
...
>>> def func2():pass
...
>>> def func3():pass

Iterate through the list ...