mypy plugin for PynamoDB

Last update: Oct 21, 2022

Related tags

Miscellaneous pynamodb-mypy

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__
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)
What's Changed

Handling overridden Model.__init__

Source code(tar.gz)
Source code(zip)
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)

Owner

GitHub Repository

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