CFFI bindings to libyang
Python CFFI bindings to libyang.
pip install libyang
By default, the C library will be compiled and statically linked with the python _libyang.so extension.
If you already have libyang.so installed on your system (with the development headers), you can link the python extension with it by exporting the LIBYANG_INSTALL=system variable when running pip:
LIBYANG_INSTALL=system pip install libyang
>>> 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.List: 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.Leaf: name string> <libyang.schema.Container: udp-and-tcp>