> 1) It should check all predicates.
OK. Maybe later there could be an option for customization?

> 2) It should return a list of ready conditions.
OK.

> 3) It should *not* accept a list of conditions.
The list option would be to simplify the "wait" method... Avoiding things like:  {cond: (lambda: True)}

> 4) from_condition() should be removed.
OK. Could the Lock object be made part of the api, then? like "self.lock" instead of "self._lock"

I'm OK with the rest of your post. Will make new patch