add_path is now a set (prevent duplicates)

src/jflow/component.py

@@ -572,12 +572,11 @@ class Component(object):
         return new_ios,includes
     
     def add_python_execution(self, function, inputs=[], outputs=[], arguments=[], includes=[], 
-                             add_path=list(), collect=False, local=False, map=False, cmd_format=""):
+                             add_path=set(), collect=False, local=False, map=False, cmd_format=""):
 
         workflow_dir = Path(os.path.dirname(inspect.getfile(self.__class__))).parent
         lib_dir = str(workflow_dir) + os.path.sep + "lib"
-        if not lib_dir in add_path:
-            add_path.append(lib_dir)
+        add_path.add(lib_dir)
                
         if map:
             if not issubclass(inputs.__class__, list) or not issubclass(outputs.__class__, list):

src/weaver/function.py

@@ -276,11 +276,11 @@ if __name__ == '__main__':
             pass
         
         if add_path:
-            add_path += [os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'),
-                        os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', '..')]
+            add_path.update([os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'),
+                        os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', '..')])
         else: 
-            add_path = [os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'),
-                        os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', '..')]
+            add_path = {os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'),
+                        os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', '..')}
         path = ""
         for apath in add_path:
             path += "sys.path.insert(0, '" + apath + "')\n"