from ncclient import manager
from xml.dom import minidom

my_device = {
    "host": "devnetsandboxiosxe.cisco.com",
    "port": 830,
    "username": "admin",
    "password": "C1sco12345",
    "hostkey_verify": False
}

subtree_filter = """
<interfaces xmlns="http://openconfig.net/yang/interfaces">
</interfaces>
"""

with manager.connect(**my_device) as m:
    result = m.get(filter=("subtree", subtree_filter)).xml
    print(minidom.parseString(result).toprettyxml())