asyncio.async deprecated since 3.4.4 (#143)

* asyncio.async deprecated since 3.4.4

pysnmp/carrier/asyncio/dgram/base.py

@@ -31,6 +31,7 @@
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 import sys
+import platform
 import traceback
 from pysnmp.carrier.asyncio.base import AbstractAsyncioTransport
 from pysnmp.carrier import error
@@ -77,13 +78,20 @@ class DgramAsyncioProtocol(asyncio.DatagramProtocol, AbstractAsyncioTransport):
         debug.logger & debug.flagIO and debug.logger('connection_lost: invoked')
 
     # AbstractAsyncioTransport API
-
+    
+    python344 = platform.python_version_tuple() >= ('3', '4', '4')
+    
     def openClientMode(self, iface=None):
         try:
             c = self.loop.create_datagram_endpoint(
                 lambda: self, local_addr=iface, family=self.sockFamily
             )
-            self._lport = asyncio.async(c)
+            # Avoid deprecation warning for asyncio.async()
+            if python344:
+              self._lport = asyncio.ensure_future(c)
+            else: # pragma: no cover
+              self._lport = asyncio.async(c)
+            
         except Exception:
             raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
         return self

pysnmp/carrier/asyncio/dispatch.py

@@ -31,6 +31,7 @@
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 import sys
+import platform
 import traceback
 from pysnmp.carrier.base import AbstractTransportDispatcher
 from pysnmp.error import PySnmpError
@@ -40,6 +41,7 @@ try:
 except ImportError:
     import trollius as asyncio
 
+python344 = platform.python_version_tuple() >= ('3', '4', '4')
 
 class AsyncioDispatcher(AbstractTransportDispatcher):
     """AsyncioDispatcher based on asyncio event loop"""
@@ -66,10 +68,14 @@ class AsyncioDispatcher(AbstractTransportDispatcher):
                 raise
             except Exception:
                 raise PySnmpError(';'.join(traceback.format_exception(*sys.exc_info())))
-
+    
     def registerTransport(self, tDomain, transport):
         if self.loopingcall is None and self.getTimerResolution() > 0:
-            self.loopingcall = asyncio.async(self.handle_timeout())
+            # Avoid deprecation warning for asyncio.async()
+            if python344:
+              self.loopingcall = asyncio.ensure_future(self.handle_timeout())
+            else: # pragma: no cover
+              self.loopingcall = asyncio.async(self.handle_timeout())
         AbstractTransportDispatcher.registerTransport(
             self, tDomain, transport
         )