[python] Add ability to get allowed values (#4138)

* Add function to get list of allowed values

* [python] Add function to get list of allowed values

* Remove temporary variable

* Remove static method and use a variable

* Remove classname

modules/openapi-generator/src/main/resources/python/model.mustache

@@ -27,6 +27,10 @@ class {{classname}}(object):
 {{/-last}}
 {{/enumVars}}{{/allowableValues}}
 
+{{#allowableValues}}
+    allowable_values = [{{#enumVars}}{{name}}{{^-last}}, {{/-last}}{{/enumVars}}]  # noqa: E501
+
+{{/allowableValues}}
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/client/petstore/python/petstore_api/models/enum_class.py

@@ -32,6 +32,8 @@ class EnumClass(object):
     _EFG = "-efg"
     _XYZ_ = "(xyz)"
 
+    allowable_values = [_ABC, _EFG, _XYZ_]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/client/petstore/python/petstore_api/models/outer_enum.py

@@ -32,6 +32,8 @@ class OuterEnum(object):
     APPROVED = "approved"
     DELIVERED = "delivered"
 
+    allowable_values = [PLACED, APPROVED, DELIVERED]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/openapi3/client/petstore/python/petstore_api/models/enum_class.py

@@ -32,6 +32,8 @@ class EnumClass(object):
     _EFG = "-efg"
     _XYZ_ = "(xyz)"
 
+    allowable_values = [_ABC, _EFG, _XYZ_]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/openapi3/client/petstore/python/petstore_api/models/outer_enum.py

@@ -32,6 +32,8 @@ class OuterEnum(object):
     APPROVED = "approved"
     DELIVERED = "delivered"
 
+    allowable_values = [PLACED, APPROVED, DELIVERED]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/openapi3/client/petstore/python/petstore_api/models/outer_enum_default_value.py

@@ -32,6 +32,8 @@ class OuterEnumDefaultValue(object):
     APPROVED = "approved"
     DELIVERED = "delivered"
 
+    allowable_values = [PLACED, APPROVED, DELIVERED]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/openapi3/client/petstore/python/petstore_api/models/outer_enum_integer.py

@@ -32,6 +32,8 @@ class OuterEnumInteger(object):
     _1 = "1"
     _2 = "2"
 
+    allowable_values = [_0, _1, _2]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name

samples/openapi3/client/petstore/python/petstore_api/models/outer_enum_integer_default_value.py

@@ -32,6 +32,8 @@ class OuterEnumIntegerDefaultValue(object):
     _1 = "1"
     _2 = "2"
 
+    allowable_values = [_0, _1, _2]  # noqa: E501
+
     """
     Attributes:
       openapi_types (dict): The key is attribute name