Fix mypy for datetime properties

Have to cast the string value to a string in the from_dict function of models with a datetime property.

Author: dbanty

CHANGELOG.md

@@ -4,5 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 0.1.0 - YYYY-MM-DD
+## 0.1.1 - 2020-03-06
+- Fix mypy issue in generated models with datetime properties
+
+## 0.1.0 - 2020-02-28
 - Initial Release

openapi_python_client/templates/datetime_property.pyi

@@ -3,5 +3,5 @@
 {% else %}
         {{ property.name }} = None
         if ({{ property.name }}_string := d.get("{{ property.name }}")) is not None:
-            {{ property.name }} = datetime.fromisoformat({{ property.name }}_string)
+            {{ property.name }} = datetime.fromisoformat(cast(str, {{ property.name }}_string))
 {% endif %}

openapi_python_client/templates/model.pyi

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 from datetime import datetime
-from typing import Dict, List, Optional
+from typing import Dict, List, Optional, cast
 
 {% for relative in schema.relative_imports %}
 {{ relative }}