Is there a lint tool that can spot unused classes/methods/attributes/functions/etc?

[Peter Otten]

Mark Summerfield wrote:

> Suppose I have a project with an application .py file and various module
> .py files all in the same directory, and after lots of refactoring and
> other changes the modules contain lots of unused stuff. Is there a lint
> tool that will spot the unused things so that I can get rid of them?
> 
> I've tried flake and pylint but neither seem to help.

I often "find" unused code with coverage.py. However, it cannot detect 
statements that are executed but have no effect, and thus will report only
A.z() and func() in the example below.
 
> Here's the smallest example I can think of:
> 
> # app.py
> import Mod
> a = Mod.A()
> print(a.quack())
> 
> # Mod.py
> class A: # Used in app.py
>     def __init__(self):
>         self.x = "hello" # Used in quack() which is used in app.py
>         self.y = 7 # Unused
>     @property
>     def z(self): # Unused
>         return 4.5
>     def quack(self): # Used in app.py
>         return self.x
> class B: # Unused
>     pass
> CONST = 999 # Unused
> def func(): # Unused
>     pass
> 
> Thanks.