[Python-experimental] Should accept float value serialized without decimal point (#6386)

* Mustache template should use invokerPackage tag to generate import

* A float may be serialized as an integer, e.g. '3' is a valid serialized float

* A float may be serialized as an integer, e.g. '3' is a valid serialized float

* add unit tests

modules/openapi-generator/src/main/resources/python/python-experimental/model_utils.mustache

@@ -229,6 +229,7 @@ COERCION_INDEX_BY_TYPE = {
 UPCONVERSION_TYPE_PAIRS = (
     (str, datetime),
     (str, date),
+    (int, float),             # A float may be serialized as an integer, e.g. '3' is a valid serialized float.
     (list, ModelComposed),
     (dict, ModelComposed),
     (list, ModelNormal),

samples/client/petstore/python-experimental/petstore_api/model_utils.py

@@ -496,6 +496,7 @@ COERCION_INDEX_BY_TYPE = {
 UPCONVERSION_TYPE_PAIRS = (
     (str, datetime),
     (str, date),
+    (int, float),             # A float may be serialized as an integer, e.g. '3' is a valid serialized float.
     (list, ModelComposed),
     (dict, ModelComposed),
     (list, ModelNormal),

samples/openapi3/client/petstore/python-experimental/petstore_api/model_utils.py

@@ -496,6 +496,7 @@ COERCION_INDEX_BY_TYPE = {
 UPCONVERSION_TYPE_PAIRS = (
     (str, datetime),
     (str, date),
+    (int, float),             # A float may be serialized as an integer, e.g. '3' is a valid serialized float.
     (list, ModelComposed),
     (dict, ModelComposed),
     (list, ModelNormal),

samples/openapi3/client/petstore/python-experimental/tests/test_deserialization.py

@@ -162,6 +162,27 @@ class DeserializationTests(unittest.TestCase):
         self.assertEqual(deserialized.type, zebra_type)
         self.assertEqual(deserialized.class_name, class_name)
 
+    def test_deserialize_float_value(self):
+        """
+        Deserialize floating point values.
+        """
+        data = {
+          'lengthCm': 3.1415
+        }
+        response = MockResponse(data=json.dumps(data))
+        deserialized = self.deserialize(response, (petstore_api.Banana,), True)
+        self.assertTrue(isinstance(deserialized, petstore_api.Banana))
+        self.assertEqual(deserialized.length_cm, 3.1415)
+
+        # Float value is serialized without decimal point
+        data = {
+          'lengthCm': 3
+        }
+        response = MockResponse(data=json.dumps(data))
+        deserialized = self.deserialize(response, (petstore_api.Banana,), True)
+        self.assertTrue(isinstance(deserialized, petstore_api.Banana))
+        self.assertEqual(deserialized.length_cm, 3.0)
+
     def test_deserialize_fruit_null_value(self):
         """
         deserialize fruit with null value.