Returns a (task, description) tuple for a given task

def get_task(self, task=None):
        """
        Returns a (task, description) tuple for a given task
        """
        # Iterate over the grindstone tasks
        for t in self.grindstone['tasks']:
            # if they key matches the task
            if key_of(t) == task:
                # Return this task
                return t
        # Otherwise return nothing
        return None