python sqlAlchemy: got InvalidRequestError after change class location

Question

If I put the CapacityMin class and unittest class in same .py file, every things fine. But after I move CapacityMin class to a separa

Answer 1

You are using the module, not the class within the module.

I suspect that you are using it like this:

from Entities import CapacityMin

while you meant to use:

from Entities.CapacityMin import CapacityMin

This kind of confusion is one of the reasons that the Python styleguide (PEP 8) recommends using lowercase names for your modules; your import would then be:

from entities.capacitymin import CapacityMin

and your error would have been easier to spot.