From 609f59ce4152a1cfec4361f72a316d1a177728c4 Mon Sep 17 00:00:00 2001
From: Dave Halter <davidhalter88@gmail.com>
Date: Thu, 18 Jan 2018 09:54:19 +0100
Subject: [PATCH] Fix issues with random tuples in TreeArgument.

Thanks @micbou for noticing it.
https://github.com/davidhalter/jedi/commit/b92c7d3351a34052237df4a292ec81ef97647e7f
---
 jedi/evaluate/arguments.py   | 43 ++++++++++++++++++------------------
 jedi/evaluate/dynamic.py     |  2 +-
 jedi/evaluate/syntax_tree.py |  2 +-
 3 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/jedi/evaluate/arguments.py b/jedi/evaluate/arguments.py
index 55f1f837..48c0d5e6 100644
--- a/jedi/evaluate/arguments.py
+++ b/jedi/evaluate/arguments.py
@@ -98,29 +98,28 @@ class TreeArguments(AbstractArguments):
         self.trailer = trailer  # Can be None, e.g. in a class definition.
 
     def _split(self):
-        if isinstance(self.argument_node, (tuple, list)):
-            for el in self.argument_node:
-                yield 0, el
-        else:
-            if not (self.argument_node.type == 'arglist' or (
-                    # in python 3.5 **arg is an argument, not arglist
-                    (self.argument_node.type == 'argument') and
-                     self.argument_node.children[0] in ('*', '**'))):
-                yield 0, self.argument_node
-                return
+        if self.argument_node is None:
+            return
 
-            iterator = iter(self.argument_node.children)
-            for child in iterator:
-                if child == ',':
-                    continue
-                elif child in ('*', '**'):
-                    yield len(child.value), next(iterator)
-                elif child.type == 'argument' and \
-                        child.children[0] in ('*', '**'):
-                    assert len(child.children) == 2
-                    yield len(child.children[0].value), child.children[1]
-                else:
-                    yield 0, child
+        if not (self.argument_node.type == 'arglist' or (
+                # in python 3.5 **arg is an argument, not arglist
+                (self.argument_node.type == 'argument') and
+                 self.argument_node.children[0] in ('*', '**'))):
+            yield 0, self.argument_node
+            return
+
+        iterator = iter(self.argument_node.children)
+        for child in iterator:
+            if child == ',':
+                continue
+            elif child in ('*', '**'):
+                yield len(child.value), next(iterator)
+            elif child.type == 'argument' and \
+                    child.children[0] in ('*', '**'):
+                assert len(child.children) == 2
+                yield len(child.children[0].value), child.children[1]
+            else:
+                yield 0, child
 
     def unpack(self, funcdef=None):
         named_args = []
diff --git a/jedi/evaluate/dynamic.py b/jedi/evaluate/dynamic.py
index 7d05000d..ff38fc80 100644
--- a/jedi/evaluate/dynamic.py
+++ b/jedi/evaluate/dynamic.py
@@ -156,7 +156,7 @@ def _check_name_for_execution(evaluator, context, compare_node, name, trailer):
     def create_func_excs():
         arglist = trailer.children[1]
         if arglist == ')':
-            arglist = ()
+            arglist = None
         args = TreeArguments(evaluator, context, arglist, trailer)
         if value_node.type == 'funcdef':
             yield value.get_function_execution(args)
diff --git a/jedi/evaluate/syntax_tree.py b/jedi/evaluate/syntax_tree.py
index 123617da..984434fc 100644
--- a/jedi/evaluate/syntax_tree.py
+++ b/jedi/evaluate/syntax_tree.py
@@ -119,7 +119,7 @@ def eval_node(context, element):
 def eval_trailer(context, base_contexts, trailer):
     trailer_op, node = trailer.children[:2]
     if node == ')':  # `arglist` is optional.
-        node = ()
+        node = None
 
     if trailer_op == '[':
         trailer_op, node, _ = trailer.children