Merge pull request #1167 from mathics/pymathics-onload

adding onload hook to pymathics

Author: mmatera

mathics/core/definitions.py

@@ -162,6 +162,12 @@ def load_pymathics_module(self, module, remove_on_quit=True):
         for name, item in newsymbols.items():
             if name != "System`MakeBoxes":
                 item.contribute(self, is_pymodule=True)
+
+
+        onload = loaded_module.pymathics_version_data.get("onload", None)
+        if onload:
+            onload(self)
+            
         return loaded_module
 
     def clear_pymathics_modules(self):