Fix issues with octals in Python 2 (and possibly 3). Fixes #559.

jedi/parser/tokenize.py

@@ -52,7 +52,10 @@ name = r'\w+'
 
 hex_number = r'0[xX][0-9a-fA-F]+'
 bin_number = r'0[bB][01]+'
-oct_number = r'0[oO][0-7]+'
+if is_py3:
+    oct_number = r'0[oO][0-7]+'
+else:
+    oct_number = '0[0-7]+'
 dec_number = r'(?:0+|[1-9][0-9]*)'
 int_number = group(hex_number, bin_number, oct_number, dec_number)
 exponent = r'[eE][-+]?[0-9]+'

jedi/parser/tree.py

@@ -664,6 +664,9 @@ class ErrorNode(BaseNode):
     __slots__ = ()
     type = 'error_node'
 
+    def nodes_to_execute(self, last_added=False):
+        return []
+
 
 class ErrorLeaf(LeafWithNewLines):
     """