From a99b61456e8a9317e7ac6f0532a20937ebb5b8c8 Mon Sep 17 00:00:00 2001
From: Matthew Rocklin <mrocklin@gmail.com>
Date: Tue, 2 May 2017 11:01:08 -0400
Subject: [PATCH] Assume modules with __file__ attribute are not dynamic

Fixes https://github.com/cloudpipe/cloudpickle/issues/84

If a module has a `__file__` attribute then we assume that it is not
dynamically generated.  This allows the common case to be much faster
than otherwise.
---
 cloudpickle/cloudpickle.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/cloudpickle/cloudpickle.py b/cloudpickle/cloudpickle.py
index fb40342e8..ed137aefe 100644
--- a/cloudpickle/cloudpickle.py
+++ b/cloudpickle/cloudpickle.py
@@ -176,11 +176,14 @@ def save_module(self, obj):
         """
         mod_name = obj.__name__
         # If module is successfully found then it is not a dynamically created module
-        try:
-            _find_module(mod_name)
+        if hasattr(obj, '__file__'):
             is_dynamic = False
-        except ImportError:
-            is_dynamic = True
+        else:
+            try:
+                _find_module(mod_name)
+                is_dynamic = False
+            except ImportError:
+                is_dynamic = True
 
         self.modules.add(obj)
         if is_dynamic: