topic Can't set leaf-based attribute value using YLeaf instance in Tools

Can't set leaf-based attribute value using YLeaf instance

aligang1988 — Tue, 12 Jun 2018 15:55:27 GMT

HI !

Here http://ydk.cisco.com/py/docs/api/types.html#ydk.types.YLeaf found information,that such class as YLeaf actually exists within ydk.
Semantics of YLeaf is to be a reflection of yang-leaf data-type within YDK.

I decided to perform some test
1. In this piece of code value of leaf-meaning attribute is set using str-type object (set_leaf_using_str_type_object.py). This approach is proven to be functional, simple and demonstrated in all examples I just can remember, but has one drawback. yfilter is not applicable

2. Here i tried to set value of leaf-meaning attribute using YLeaf-type object (set_leaf_using_yleaf_type_object.py). But execution failes with:

root@YDK072:~/trash# python set_leaf_using_yleaf_type_object.py

Traceback (most recent call last):

File "set_leaf_using_yleaf_type_object.py", line 28, in <module>

ge000.name = leaf_instance

File "/usr/local/lib/python2.7/dist-packages/ydk/models/junos/configuration.py", line 1203298, in __setattr__

self._perform_setattr(Configuration.Interfaces.Interface, ['name', 'apply_groups', 'apply_groups_except', 'description', 'disable', 'passive_monitor_mode', 'no_keepalives', 'traps', 'no_traps', 'interface_mib', 'no_interface_mib', 'accounting_profile', 'per_unit_scheduler', 'no_per_unit_scheduler', 'shared_scheduler', 'l2tp_maximum_session', 'schedulers', 'dce', 'vlan_tagging', 'stacked_vlan_tagging', 'flexible_vlan_tagging', 'native_vlan_id', 'speed', 'mtu', 'link_mode', 'encapsulation', 'mac', 'shared_interface', 'gratuitous_arp_reply', 'no_gratuitous_arp_reply', 'no_gratuitous_arp_request', 'no_no_gratuitous_arp_request'], name, value)

File "/usr/local/lib/python2.7/dist-packages/ydk/types/py_types.py", line 416, in _perform_setattr

super(Entity, self).__setattr__(name, value)

File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__

self.gen.throw(type, value, traceback)

File "/usr/local/lib/python2.7/dist-packages/ydk/errors/error_handler.py", line 95, in handle_type_error

_raise(_exc)

File "/usr/local/lib/python2.7/dist-packages/ydk/errors/error_handler.py", line 56, in _raise

raise exc

ydk.errors.YModelError: set(): incompatible function arguments. The following argument types are supported:

1. (self: ydk_.types.YLeaf, value: int) -> None

2. (self: ydk_.types.YLeaf, value: int) -> None

3. (self: ydk_.types.YLeaf, value: int) -> None

4. (self: ydk_.types.YLeaf, value: int) -> None

5. (self: ydk_.types.YLeaf, value: int) -> None

6. (self: ydk_.types.YLeaf, value: int) -> None

7. (self: ydk_.types.YLeaf, value: float) -> None

8. (self: ydk_.types.YLeaf, value: ydk_.types.Empty) -> None

9. (self: ydk_.types.YLeaf, value: ydk_.types.Identity) -> None

10. (self: ydk_.types.YLeaf, value: ydk_.types.Bits) -> None

11. (self: ydk_.types.YLeaf, value: unicode) -> None

12. (self: ydk_.types.YLeaf, value: ydk_.types.Enum.YLeaf) -> None

13. (self: ydk_.types.YLeaf, value: ydk_.types.Decimal64) -> None

Q: Is it expected behavior, that YLeaf type object can not be used as value for leaf-meaning attribute ?
Is there any other options to define netconf operation (replace,delete, etc) for leaf data-structure ?

Thanks !

Re: Can't set leaf-based attribute value using YLeaf instance

abhirame — Tue, 12 Jun 2018 21:19:58 GMT

Please refer to the developer guide which has some example for this. You may want to use YFilter for netconf operations. YLeaf is just used internally to represent leafs and is not intended to be used by end user

http://ydk.cisco.com/py/docs/api/filters.html

http://ydk.cisco.com/py/docs/guides/crud_guide.html

Re: Can't set leaf-based attribute value using YLeaf instance

aligang1988 — Fri, 15 Jun 2018 09:25:47 GMT

Is my understanding right, that currently leaf value may be assigned with delete/remove nc:operation tag only?

In this case leaf_like object attributes are assigned with YFilter class object, as it explained here http://ydk.cisco.com/py/docs/guides/crud_guide.html#deleting-a-leaf ?

Another type of operations (such as create, merge, replace ) may not be specified directly for leaf_like attribute, because it based on standard python datatypes (int,bool, str), which have no .yfilter attribute. Such operation tags only may be inherited from parent configuration block (list, leaf-list, container), which are based on ydk specific datatypes and have .yfilter attribute.

Re: Can't set leaf-based attribute value using YLeaf instance

abhirame — Fri, 15 Jun 2018 17:02:50 GMT

Hi,

Any of the YFilter options can be used with leafs.

Following the above example, something like the below should work

# Set a dummy value to the leaf
cdp.timer = 5
# Assign YFilter.replace to the 'timer' leaf
cdp.timer = YFilter.replace

Re: Can't set leaf-based attribute value using YLeaf instance

aligang1988 — Mon, 25 Jun 2018 11:34:54 GMT

Yes, it works in the way you previously explained !
Thanks !