How to check if a python class or object is user defined (not a builtin)?

I need to examine a python module to find simple data as well as "user defined objects". Here, I mean objects (or functions or classes) that are not builtin, but defined with a class/def statement or dynamically loaded/generated.

Note there are similar questions, but they ask about "new style user defined classes". I've seen the inspect module - I couldn't see how it could help.

I can import a module and 'walk' it, but I don't know an easy way to identify an attribute as a simple type. eg - how do I tell 0. is a builtin type? here:

>>> a=0.
>>> dir(a)
['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__'...
>>> type(a)
<class 'float'>

Do I have to know the classes of all the standard objects to determine if an attribute of a module/object is "user defined"?

Solution

Try checking if the types module is builtin, usually works for me.

For example:

a = 1.2
type(a).__module__ == "__builtin__"