Merge pull request #40 from jhermann/patch-1

Fix value vs object identity error (closes #39)

Author: bobbui

json_logging/util.py

@@ -184,9 +184,8 @@ def get_request_from_call_stack(self):
                     return f_locals['req']
 
             for key in f_locals:
-                if key is not 'request' and key is not 'req':
-                    if isinstance(f_locals[key], class_type):
-                        return f_locals[key]
+                if key not in {'request', 'req'} and isinstance(f_locals[key], class_type):
+                    return f_locals[key]
             if f.f_back is not None:
                 f = f.f_back
             else: