I have not found a way to report these bugs when updating Google Cloud SDK via apt-get on Ubuntu 18.04, so posting them here.
Setting up google-cloud-sdk (274.0.0-0) ...
Compiling platform/bq/third_party/yaml/lib3/__init__.py ...
File "platform/bq/third_party/yaml/lib3/__init__.py", line 284
class YAMLObject(metaclass=YAMLObjectMetaclass):
^
SyntaxError: invalid syntax
...
Processing triggers for google-cloud-sdk (274.0.0-0) ...
Compiling platform/bq/third_party/yaml/lib3/__init__.py ...
File "platform/bq/third_party/yaml/lib3/__init__.py", line 284
class YAMLObject(metaclass=YAMLObjectMetaclass):
^
SyntaxError: invalid syntax
Setting up google-cloud-sdk-app-engine-go (274.0.0-0) ...
Processing triggers for google-cloud-sdk (274.0.0-0) ...
Compiling platform/bq/third_party/yaml/lib3/__init__.py ...
File "platform/bq/third_party/yaml/lib3/__init__.py", line 284
class YAMLObject(metaclass=YAMLObjectMetaclass):
^
SyntaxError: invalid syntax