When using pytest, I get nice pretty printing when two objects are not equivalent:

Expected :Foo(id='red', other_thing='green')
Actual   :Foo(id='red', other_thing='blue')
<Click to see difference>

def test_baz():
    
        oneFoo = Foo(id="red", other_thing="blue")
        twoFoo = Foo(id="red", other_thing="green")
    
>       assert oneFoo == twoFoo
E       AssertionError: assert Foo(id='red', other_thing='blue') == Foo(id='red', other_thing='green')
E         
E         Full diff:
E         - Foo(id='red', other_thing='green')
E         ?                            ^^ --
E         + Foo(id='red', other_thing='blue')
E         ?                            ^^^

baz.py:22: AssertionError

If I use an assert directly in my code, I just get an AssertionError and a stacktrace.

I am writing some integration tests right now that are NOT driven by pytest but would like to pretty print when two items (specifically Pydantic dataclasses) are not equal.