Django Book 翻译
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原文:
Filter functions should always return something. They shouldnt raise exceptions, and they should fail silently. If theres an error, they should return either the original input or an empty string, whichever makes more sense.
翻译:
过滤器函数应该总有返回值，而且不能触发异常，它们都应该静静的失败。如果有一个错误发生，它们要么返回原始的输入字符串，要么返回空的字符串，无论哪个都可以。
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