Move imports in snmp component (#27939)

* move imports in snmp component

* fix: move hlapi import top level

homeassistant/components/snmp/sensor.py

@@ -2,6 +2,17 @@
 from datetime import timedelta
 import logging
 
+import pysnmp.hlapi.asyncio as hlapi
+from pysnmp.hlapi.asyncio import (
+    CommunityData,
+    ContextData,
+    ObjectIdentity,
+    ObjectType,
+    SnmpEngine,
+    UdpTransportTarget,
+    UsmUserData,
+    getCmd,
+)
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
@@ -70,16 +81,6 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 
 async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
     """Set up the SNMP sensor."""
-    from pysnmp.hlapi.asyncio import (
-        getCmd,
-        CommunityData,
-        SnmpEngine,
-        UdpTransportTarget,
-        ContextData,
-        ObjectType,
-        ObjectIdentity,
-        UsmUserData,
-    )
 
     name = config.get(CONF_NAME)
     host = config.get(CONF_HOST)
@@ -101,7 +102,6 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
         value_template.hass = hass
 
     if version == "3":
-        import pysnmp.hlapi.asyncio as hlapi
 
         if not authkey:
             authproto = "none"
@@ -194,7 +194,6 @@ class SnmpData:
 
     async def async_update(self):
         """Get the latest data from the remote SNMP capable host."""
-        from pysnmp.hlapi.asyncio import getCmd, ObjectType, ObjectIdentity
 
         errindication, errstatus, errindex, restable = await getCmd(
             *self._request_args, ObjectType(ObjectIdentity(self._baseoid))