pylightning: Allow both kwargs as well as positional args

We don't allow a mix (just like JSON-RPC), but we can use either or
now.

Signed-off-by: Christian Decker <decker.christian@gmail.com>

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Changed
 
 - JSON API: `pay` and `decodepay` accept and ignore `lightning:` prefixes.
+- pylightning: Allow either keyword arguments or positional arguments.
 
 ### Deprecated
 

contrib/pylightning/lightning/lightning.py

@@ -48,7 +48,12 @@ class UnixDomainSocketRpc(object):
         """
         name = name.replace('_', '-')
 
-        def wrapper(**kwargs):
+        def wrapper(*args, **kwargs):
+            if len(args) != 0 and len(kwargs) != 0:
+                raise RpcError("Cannot mix positional and non-positional arguments")
+            elif len(args) != 0:
+                return self.call(name, payload=args)
+            else:
                 return self.call(name, payload=kwargs)
         return wrapper
 
@@ -58,6 +63,7 @@ class UnixDomainSocketRpc(object):
         if payload is None:
             payload = {}
         # Filter out arguments that are None
+        if isinstance(payload, dict):
             payload = {k: v for k, v in payload.items() if v is not None}
 
         # FIXME: we open a new socket for every readobj call...