Merge b82a559 into dd9e11e

.appveyor.yml

@@ -4,6 +4,9 @@ environment:
       PYTHON_MINOR: 7
     - PYTHON_MAJOR: 3
       PYTHON_MINOR: 8
+    # TODO: Enable this when Python 3.9 is available in the default images
+    # - PYTHON_MAJOR: 3
+    #   PYTHON_MINOR: 9
 
 cache:
   - .venv -> poetry.lock

.travis.yml

@@ -4,6 +4,7 @@ language: python
 python:
   - 3.7
   - 3.8
+  - 3.9
 
 cache:
   pip: true

datafiles/converters/__init__.py

@@ -47,7 +47,7 @@ def map_type(cls, *, name: str = '', item_cls: Optional[type] = None):
     if dataclasses.is_dataclass(cls):
         converters = {}
         for field in dataclasses.fields(cls):
-            converters[field.name] = map_type(field.type, name=field.name)
+            converters[field.name] = map_type(field.type, name=field.name)  # type: ignore
         converter = Dataclass.of_mappings(cls, converters)
         log.debug(f'Mapped {cls!r} to new converter: {converter}')
         return converter

datafiles/mapper.py

@@ -212,7 +212,7 @@ def _infer_attr(name, value):
                 log.warn(f'{name!r} list type cannot be inferred')
                 item_cls = Converter
             log.debug(f'Inferring {name!r} type: {cls} of {item_cls}')
-            return map_type(cls, name=name, item_cls=item_cls)
+            return map_type(cls, name=name, item_cls=item_cls)  # type: ignore
 
         if issubclass(cls, dict):
             cls.__origin__ = dict
@@ -290,7 +290,7 @@ def create_mapper(obj, root=None) -> Mapper:
         for field in dataclasses.fields(obj):
             self_name = f'self.{field.name}'
             if pattern is None or self_name not in pattern:
-                attrs[field.name] = map_type(field.type, name=field.name)
+                attrs[field.name] = map_type(field.type, name=field.name)  # type: ignore
 
     return Mapper(
         obj,

pyproject.toml

@@ -32,6 +32,7 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python",
     "Topic :: Software Development",
     "Topic :: Utilities",
@@ -64,8 +65,8 @@ black = "=20.8b1"
 isort = "=5.5.1"
 
 # Linters
-mypy = "*"
-pylint = '~2.6'
+mypy = "~0.790"
+pylint = "~2.6"
 pydocstyle = "*"
 
 # Testing