Resolved GitHub issue CiscoDevNet#983

.travis.yml

@@ -7,23 +7,23 @@ matrix:
 #   - os: linux
 #     dist: trusty
 #     group: edge
-   - os: osx
-     osx_image: xcode9.2
-     language: generic
-     go: 1.9
-   - os: osx
-     env: GNMI=true
-     osx_image: xcode9.2
-     language: generic
-     go: 1.9
+#   - os: osx
+#     osx_image: xcode9.2
+#     language: generic
+#     go: 1.9
+#   - os: osx
+#     env: GNMI=true
+#     osx_image: xcode9.2
+#     language: generic
+#     go: 1.9
 #   - env: DOCKER=true OS_TYPE=centos OS_VERSION=centos7 PYTHON_VERSION=2.7
 #   - env: DOCKER=true OS_TYPE=centos OS_VERSION=centos7 PYTHON_VERSION=2.7 GNMI=true
    - env: DOCKER=true OS_TYPE=centos OS_VERSION=centos7 PYTHON_VERSION=3.6
    - env: DOCKER=true OS_TYPE=centos OS_VERSION=centos7 PYTHON_VERSION=3.6 GNMI=true
 #   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=2.7
 #   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=2.7 GNMI=true
-   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=3.5
-   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=3.5 GNMI=true
+#   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=3.5
+#   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=xenial  PYTHON_VERSION=3.5 GNMI=true
 #   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=bionic  PYTHON_VERSION=2.7
 #   - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=bionic  PYTHON_VERSION=2.7 GNMI=true
    - env: DOCKER=true OS_TYPE=ubuntu OS_VERSION=bionic  PYTHON_VERSION=3

CHANGES.md

@@ -9,9 +9,11 @@
   * Enhance generator to indicate how a YANG modules was processed ([#894](https://github.com/CiscoDevNet/ydk-gen/issues/894))
   * YDK fails create bundle package when package name contains '.' ([#978](https://github.com/CiscoDevNet/ydk-gen/issues/978))
   * python bundle generator must escape 'async' as variable name ([#980](https://github.com/CiscoDevNet/ydk-gen/issues/980))
+  * YDK fails instantiate some of the generated bundle classes ([#983](https://github.com/CiscoDevNet/ydk-gen/issues/983))
 
 #### Bundle improvements
   * Updated cisco-ios-xe bundle to support Cisco IOS XE 16.9.3 due to bug in Python generated code
+  * Updated cisco-ios-xr bundle to support Cisco IOS XR 6.6.3
 
 #### Documentation improvements
   * Bundle profile description is not accurate ([#971](https://github.com/CiscoDevNet/ydk-gen/issues/971))

sdk/python/CHANGES.md

@@ -5,9 +5,11 @@
 
 #### Resolved GitHub issues
   * python bundle generator must escape 'async' as variable name ([#980](https://github.com/CiscoDevNet/ydk-gen/issues/980))
+  * YDK fails instantiate some of the generated bundle classes ([#983](https://github.com/CiscoDevNet/ydk-gen/issues/983))
 
 #### Bundle improvements
   * Updated cisco-ios-xe bundle to support Cisco IOS XE 16.9.3 due to bug in Python generated code
+  * Updated cisco-ios-xr bundle to support Cisco IOS XR 6.6.3
 
 
 ### 2019-10-15 version 0.8.4

sdk/python/core/ydk/entity_utils/entity_utils.py

@@ -81,8 +81,8 @@ def _datanode_to_entity(data_node):
                 try:
                     imported_module = importlib.import_module('ydk.models.{}.{}'.format(name, module_name))
                     entity = getattr(imported_module, class_name)()
-                except:
-                    raise YModelError("Failed instantiate class '{}' from module '{}'".format(class_name, module_name))
+                except Exception as err:
+                    raise YModelError("Failed instantiate class '{}' from module '{}': {}".format(class_name, module_name, err))
 
                 top_entity = entity.clone_ptr()
                 get_entity_from_data_node(data_node, top_entity)

ydkgen/printer/python/class_printer.py

@@ -102,7 +102,7 @@ def _print_class_trailer(self, clazz):
     def _print_class_declaration(self, clazz):
         self.ctx.bline()
 
-        parents = 'Entity'
+        parents = '_Entity_'
         if clazz.is_identity():
             if len(clazz.extends) > 0:
                 parents = ' ,'.join([sup.qn() for sup in clazz.extends])

ydkgen/printer/python/module_printer.py

@@ -77,6 +77,8 @@ def _print_static_imports(self):
         self.ctx.writeln("import sys")
         self.ctx.writeln("from collections import OrderedDict")
         self.ctx.bline()
+        self.ctx.writeln("from ydk.types import Entity as _Entity_")
+        self.ctx.writeln("from ydk.types import EntityPath, Identity, Enum, YType, YLeaf, YLeafList, YList, LeafDataList, Bits, Empty, Decimal64")
         self.ctx.writeln(
             "from ydk.types import Entity, EntityPath, Identity, Enum, YType, YLeaf, YLeafList, YList, LeafDataList, Bits, Empty, Decimal64")
         self.ctx.writeln("from ydk.filters import YFilter")