Ignore stdlib paths for dynamic param inference.

jedi/evaluate/helpers.py

@@ -1,4 +1,7 @@
 import copy
+import sys
+import re
+import os
 from itertools import chain
 from contextlib import contextmanager
 
@@ -6,6 +9,14 @@ from parso.python import tree
 from jedi.parser_utils import get_parent_scope
 
 
+def is_stdlib_path(path):
+    # Python standard library paths look like this:
+    # /usr/lib/python3.5/...
+    # TODO The implementation below is probably incorrect and not complete.
+    base_path = os.path.join(sys.prefix, 'lib', 'python')
+    return bool(re.match(re.escape(base_path) + '\d.\d', path))
+
+
 def deep_ast_copy(obj):
     """
     Much, much faster than copy.deepcopy, but just for parser tree nodes.