def unregisterPackage(self, package):
        if self.packages.has_key(package):
            del self.packages[package]
Helper function to create an undefined-step snippet for a step.
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/spreadsheet/spreadsheet_registry.py/SpreadsheetRegistry.unregisterPackage--crossover with--dataset/ETHPy150Open behave/behave/behave/runner_util.py/make_undefined_step_snippet