>>> import libyang
>>> ctx = libyang.Context('/usr/local/share/yang/modules')
>>> module = ctx.load_module('ietf-system')
>>> print(module)
module: ietf-system
  +--rw system
  |  +--rw contact?          string
  |  +--rw hostname?         ietf-inet-types:domain-name
  |  +--rw location?         string
  |  +--rw clock
  |  |  +--rw (timezone)?
  |  |     +--:(timezone-utc-offset)
  |  |        +--rw timezone-utc-offset?   int16
  |  +--rw dns-resolver
  |     +--rw search*    ietf-inet-types:domain-name
  |     +--rw server* [name]
  |     |  +--rw name          string
  |     |  +--rw (transport)
  |     |     +--:(udp-and-tcp)
  |     |        +--rw udp-and-tcp
  |     |           +--rw address    ietf-inet-types:ip-address
  |     +--rw options
  |        +--rw timeout?    uint8 <5>
  |        +--rw attempts?   uint8 <2>
  +--ro system-state
     +--ro platform
     |  +--ro os-name?      string
     |  +--ro os-release?   string
     |  +--ro os-version?   string
     |  +--ro machine?      string
     +--ro clock
        +--ro current-datetime?   ietf-yang-types:date-and-time
        +--ro boot-datetime?      ietf-yang-types:date-and-time

  rpcs:
    +---x set-current-datetime
    |  +---- input
    |     +---w current-datetime    ietf-yang-types:date-and-time
    +---x system-restart
    +---x system-shutdown

>>> xpath = '/ietf-system:system/ietf-system:dns-resolver/ietf-system:server'
>>> dnsserver = next(ctx.find_path(xpath))
>>> dnsserver
<libyang.schema.SList: server [name]>
>>> print(dnsserver.description())
List of the DNS servers that the resolver should query.

When the resolver is invoked by a calling application, it
sends the query to the first name server in this list.  If
no response has been received within 'timeout' seconds,
the resolver continues with the next server in the list.
If no response is received from any server, the resolver
continues with the first server again.  When the resolver
has traversed the list 'attempts' times without receiving
any response, it gives up and returns an error to the
calling application.

Implementations MAY limit the number of entries in this
list.
>>> dnsserver.ordered()
True
>>> for node in dnsserver:
...     print(repr(node))
...
<libyang.schema.SLeaf: name string>
<libyang.schema.SContainer: udp-and-tcp>
>>> ctx.destroy()
>>>

>>> import libyang
>>> ctx = libyang.Context()
>>> module = ctx.parse_module_str('''
... module example {
...   namespace "urn:example";
...   prefix "ex";
...   container data {
...     list interface {
...       key name;
...       leaf name {
...         type string;
...       }
...       leaf address {
...         type string;
...       }
...     }
...     leaf hostname {
...       type string;
...     }
...   }
... }
... ''')
>>> print(module.print_mem('tree'))
module: example
  +--rw data
     +--rw interface* [name]
     |  +--rw name       string
     |  +--rw address?   string
     +--rw hostname?    string
>>> node = module.parse_data_dict({
...     'data': {
...         'hostname': 'foobar',
...         'interface': [
...             {'name': 'eth0', 'address': '1.2.3.4/24'},
...             {'name': 'lo', 'address': '127.0.0.1'},
...         ],
...     },
... })
>>> print(node.print_mem('xml', pretty=True))
<data xmlns="urn:example">
  <interface>
    <name>eth0</name>
    <address>1.2.3.4/24</address>
  </interface>
  <interface>
    <name>lo</name>
    <address>127.0.0.1</address>
  </interface>
  <hostname>foobar</hostname>
</data>
>>> node.print_dict()
{'data': {'interface': [{'name': 'eth0', 'address': '1.2.3.4/24'}, {'name':
'lo', 'address': '127.0.0.1'}], 'hostname': 'foobar'}}
>>> node.free()
>>> ctx.destroy()
>>>