mypy plugin for PynamoDB

Overview

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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Comments
  • Type-check Model.__init__

    Type-check Model.__init__

    • Reworked attribute initialization parsing. Results are now persisted in the model type's mypy metadata.
    • Implemented a signature hook for the model's initialization. Model initialization is now type-checked.
    • Implemented miscellaneous best practices: Black formatting, test coverage.
    • Added GitHub action to run tests.
    • Minimum Python version is now 3.8.
    opened by ikonst 0
Releases(v0.1.2)
  • v0.1.2(Oct 21, 2022)

    What's Changed

    • Support derived model initializers by @ikonst in https://github.com/pynamodb/pynamodb-mypy/pull/4

    Full Changelog: https://github.com/pynamodb/pynamodb-mypy/compare/v0.1.1...v0.1.2

    Source code(tar.gz)
    Source code(zip)
  • v0.1.1(Oct 18, 2022)

  • v0.1.0(Oct 18, 2022)

    What's Changed

    • Model.__init__ calls are now type-checked: attributes types will have to match and undefined attributes will not be allowed.
    • Lowest supported Python version is now 3.8

    Internals

    • Reworked attribute initialization parsing. Results are now persisted in the model type's mypy metadata.
    Source code(tar.gz)
    Source code(zip)
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