Update introspect.py

Adds a check to determine if getfullargspec should be used. This is added in Py3 to get elements like type annotations.

wx/py/introspect.py

@@ -175,7 +175,7 @@ def getCallTip(command='', locals=None):
         pass
     elif inspect.isfunction(obj):
         # tip1 is a string like: "getCallTip(command='', locals=None)"
-        argspec = inspect.getargspec(obj)
+        argspec = inspect.getargspec(obj) if not PY3 else inspect.getfullargspec(obj)
         argspec = inspect.formatargspec(*argspec)
         if dropSelf:
             # The first parameter to a method is a reference to an