def METHOD_NAME(self, pathname, setting):
    """
    _addEnvironmentPath_
    add a key = value1:value2:value3 environment setting to this step
    """
    if getattr(self.data.environment.paths, pathname, None) == None:
        setattr(self.data.environment.paths, pathname, [])
    pathentry = getattr(self.data.environment.paths, pathname)
    pathentry.append(setting)
    return