Fix py3.7 syntax error caused by async keyword (#180)

As async is the keyword since Python 3.7, let's use gettattr
built-in function to call async function from asyncio.

2 files changed, 3 insertions, 3 deletions

diff --git a/pysnmp/carrier/asyncio/dgram/base.py b/pysnmp/carrier/asyncio/dgram/base.py
index e06e8ee5..93e58457 100644
--- a/pysnmp/carrier/asyncio/dgram/base.py
+++ b/pysnmp/carrier/asyncio/dgram/base.py
@@ -90,7 +90,7 @@ class DgramAsyncioProtocol(asyncio.DatagramProtocol, AbstractAsyncioTransport):
             if IS_PYTHON_344_PLUS:
               self._lport = asyncio.ensure_future(c)
             else: # pragma: no cover
-              self._lport = asyncio.async(c)
+              self._lport = getattr(asyncio, 'async')(c)
 
         except Exception:
             raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
@@ -101,7 +101,7 @@ class DgramAsyncioProtocol(asyncio.DatagramProtocol, AbstractAsyncioTransport):
             c = self.loop.create_datagram_endpoint(
                 lambda: self, local_addr=iface, family=self.sockFamily
             )
-            self._lport = asyncio.async(c)
+            self._lport = getattr(asyncio, 'async')(c)
         except Exception:
             raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
         return self
diff --git a/pysnmp/carrier/asyncio/dispatch.py b/pysnmp/carrier/asyncio/dispatch.py
index 2ba4cf4d..74f9ae10 100644
--- a/pysnmp/carrier/asyncio/dispatch.py
+++ b/pysnmp/carrier/asyncio/dispatch.py
@@ -75,7 +75,7 @@ class AsyncioDispatcher(AbstractTransportDispatcher):
             if IS_PYTHON_344_PLUS:
               self.loopingcall = asyncio.ensure_future(self.handle_timeout())
             else: # pragma: no cover
-              self.loopingcall = asyncio.async(self.handle_timeout())
+              self.loopingcall = getattr(asyncio, 'async')(self.handle_timeout())
         AbstractTransportDispatcher.registerTransport(
             self, tDomain, transport
         )