shader
diff --git a/‎fire/core.py
Lines changed: 10 additions & 1 deletion b/‎fire/core.py
Lines changed: 10 additions & 1 deletion
diff --git a/‎fire/fire_test.py
Lines changed: 5 additions & 0 deletions b/‎fire/fire_test.py
Lines changed: 5 additions & 0 deletions
diff --git a/‎fire/inspectutils.py
Lines changed: 11 additions & 1 deletion b/‎fire/inspectutils.py
Lines changed: 11 additions & 1 deletion
diff --git a/‎fire/test_components_py3.py
Lines changed: 8 additions & 0 deletions b/‎fire/test_components_py3.py
Lines changed: 8 additions & 0 deletions
@@ -74,6 +74,9 @@ def main(argv):
 from fire.console import console_io
 import six
 
+if six.PY34:
+  import asyncio  # pylint: disable=g-import-not-at-top,import-error  # pytype: disable=import-error
+
 
 def Fire(component=None, command=None, name=None):
   """This function, Fire, is the main entrypoint for Python Fire.
@@ -669,7 +672,13 @@ def _CallAndUpdateTrace(component, args, component_trace, treatment='class',
   fn = component.__call__ if treatment == 'callable' else component
   parse = _MakeParseFn(fn, metadata)
   (varargs, kwargs), consumed_args, remaining_args, capacity = parse(args)
-  component = fn(*varargs, **kwargs)
+
+  # Call the function.
+  if inspectutils.IsCoroutineFunction(fn):
+    loop = asyncio.get_event_loop()
+    component = loop.run_until_complete(fn(*varargs, **kwargs))
+  else:
+    component = fn(*varargs, **kwargs)
 
   if treatment == 'class':
     action = trace.INSTANTIATED_CLASS
 
@@ -721,6 +721,11 @@ def testHelpKwargsDecorator(self):
     with self.assertRaisesFireExit(0):
       fire.Fire(tc.decorated_method, command=['--help'])
 
+  @testutils.skipIf(six.PY2, 'Asyncio not available in Python 2.')
+  def testFireAsyncio(self):
+    self.assertEqual(fire.Fire(tc.py3.WithAsyncio,
+                               command=['double', '--count', '10']), 20)
+
 
 if __name__ == '__main__':
   testutils.main()
@@ -26,6 +26,9 @@
 
 import six
 
+if six.PY34:
+  import asyncio  # pylint: disable=g-import-not-at-top,import-error  # pytype: disable=import-error
+
 
 class FullArgSpec(object):
   """The arguments of a function, as in Python 3's inspect.FullArgSpec."""
@@ -250,7 +253,7 @@ def GetFileAndLine(component):
   try:
     unused_code, lineindex = inspect.findsource(component)
     lineno = lineindex + 1
-  except IOError:
+  except (IOError, IndexError):
     lineno = None
 
   return filename, lineno
@@ -360,3 +363,10 @@ def GetClassAttrsDict(component):
       class_attr.name: class_attr
       for class_attr in class_attrs_list
   }
+
+
+def IsCoroutineFunction(fn):
+  try:
+    return six.PY34 and asyncio.iscoroutinefunction(fn)
+  except:  # pylint: disable=bare-except
+    return False
@@ -15,6 +15,7 @@
 # Lint as: python3
 """This module has components that use Python 3 specific syntax."""
 
+import asyncio
 import functools
 from typing import Tuple
 
@@ -49,6 +50,13 @@ def lru_cache_decorated(arg1):
   return arg1
 
 
+class WithAsyncio(object):
+
+  @asyncio.coroutine
+  def double(self, count=0):
+    return 2 * count
+
+
 class WithTypes(object):
   """Class with functions that have default arguments and types."""