lib/pycall/eval.rb in pycall-0.1.0.alpha.20170224 vs lib/pycall/eval.rb in pycall-0.1.0.alpha.20170226

@@ -5,18 +5,23 @@
     def self.eval(str, filename: "pycall")
       globals_ptr = maindict_ptr
       locals_ptr = maindict_ptr
       defer_sigint do
         py_code_ptr = LibPython.Py_CompileString(str, filename, Py_eval_input)
+        raise PyError.fetch if py_code_ptr.null?
         LibPython.PyEval_EvalCode(py_code_ptr, globals_ptr, locals_ptr)
       end
     end
 
     class << self
       private
 
+      def main_module
+        @main_module ||= PyCall.import_module("__main__")
+      end
+
       def maindict_ptr
-        LibPython.PyModule_GetDict(PyCall.import_module("__main__"))
+        @maindict_ptr ||= LibPython.PyModule_GetDict(main_module)
       end
 
       def defer_sigint
         # TODO: should be implemented
         yield