pynamodb-mypy
A plugin for mypy which gives it deeper understanding of PynamoDB (beyond what's possible through type stubs).
Usage
Add it to the plugins option of the [mypy] section in your mypy.ini:
[mypy]
plugins = pynamodb_mypy
Nullable attributes
When 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")
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