A plugin for mypy which gives it deeper understanding of PynamoDB (beyond what's possible through type stubs).
Add it to the plugins option of the [mypy] section in your mypy.ini:
[mypy] plugins = pynamodb_mypyWhen declaring attributes with null=True, the value types would become optional. For example:
from pynamodb.attributes import UnicodeAttribute from pynamodb.models import Model class MyModel(Model): my_key = UnicodeAttribute() my_value = UnicodeAttribute(null=True) ... my_model = MyModel.get('key') if my_model.my_value.lower() == 'foo': # error: Item "None" of "Optional[str]" has no attribute "lower" print("Value is foo")would have to be changed to, e.g.:
if my_model.my_value and my_model.my_value.lower() == 'foo': print("Value is foo")