contracts on class structure

[asmodehn]

It would be helpful to check custom types.

For example if an instance of a class is defined as such :

class CustomClass(object):
    class_member = 42
    def __init__(self):
        inst_member = 23

cc_inst = CustomClass()

It would be useful to have a contract for a function that require such an instance. To keep python duck-typing semantic, we can check the instance members (just like we do for dict), but checking one by one :

@contract("object(class_member: int, inst_member: int)")
def process_custom(custom_class_instance):
    [...]

This way any object that has an int class_member and an int inst_member will satisfy the contract.

I am posting this issue because I haven't found any way to do this currently...

[AndreaCensi]

[deleted]

Sorry, I misunderstood what you meant. Yes, this would be a useful thing to have.