fix IndexErrors which sometimes happened, related to inter-module param searching

jedi/evaluate.py

@@ -127,9 +127,11 @@ class CachedMetaClass(type):
 
 class Executable(parsing.Base):
     """ An instance is also an executable - because __init__ is called """
-    def __init__(self, base, var_args=parsing.Array(None, None)):
+    def __init__(self, base, var_args=None):
         self.base = base
         # The param input array.
+        if var_args is None:
+            var_args = parsing.Array(None, None)
         self.var_args = var_args
 
     def get_parent_until(self, *args, **kwargs):
@@ -141,7 +143,7 @@ class Executable(parsing.Base):
 
 class Instance(use_metaclass(CachedMetaClass, Executable)):
     """ This class is used to evaluate instances. """
-    def __init__(self, base, var_args=parsing.Array(None, None)):
+    def __init__(self, base, var_args=None):
         super(Instance, self).__init__(base, var_args)
         if str(base.name) in ['list', 'set'] \
                     and builtin.builtin_scope == base.get_parent_until():

jedi/parsing.py

@@ -422,7 +422,8 @@ class Flow(Scope):
         else:
             self.set_vars = set_vars
             for s in self.set_vars:
-                s.parent().parent = weakref.ref(self)
+                s.parent().parent = lambda: self
+                s.parent = weakref.ref(self)
 
     @property
     def parent(self):
@@ -1601,6 +1602,7 @@ class PyFuzzyParser(object):
         self.freshscope = True
         while True:
             try:
+                self.module.temp_used_names = []
                 token_type, tok = self.next()
                 #debug.dbg('main: tok=[%s] type=[%s] indent=[%s]'\
                 #    % (tok, tokenize.tok_name[token_type], start_position[0]))