diff --git a/jedi/evaluate/imports.py b/jedi/evaluate/imports.py
index 62643771..5592403e 100644
--- a/jedi/evaluate/imports.py
+++ b/jedi/evaluate/imports.py
@@ -511,7 +511,9 @@ def remove_star_imports(evaluator, scope, ignored_modules=()):
 
 def _load_module(path=None, source=None, name=None, sys_path=None):
     def load(source):
-        if path is not None and path.endswith('.py'):
+        dotted_path = path and _reverse_fs_path(path, sys_path)
+        if path is not None and path.endswith('.py') \
+                and not dotted_path in settings.auto_import_modules:
             if source is None:
                 with open(path, 'rb') as f:
                     source = f.read()
diff --git a/jedi/settings.py b/jedi/settings.py
index 54e801e9..a0839e99 100644
--- a/jedi/settings.py
+++ b/jedi/settings.py
@@ -42,6 +42,7 @@ Dynamic stuff
 .. autodata:: dynamic_params
 .. autodata:: dynamic_params_for_other_modules
 .. autodata:: additional_dynamic_modules
+.. autodata:: auto_import_modules
 
 
 .. _settings-recursion:
@@ -179,6 +180,13 @@ dynamic_flow_information = True
 Check for `isinstance` and other information to infer a type.
 """
 
+auto_import_modules = ['hashlib']
+"""
+Modules that are not analyzed but imported, although they contain Python code.
+This improves autocompletion for libraries that use ``setattr`` or
+``globals()`` modifications a lot.
+"""
+
 # ----------------
 # recursions
 # ----------------