错误默认值造成的郁闷
妙音
posted @ 2013年12月30日 10:37
in coding
, 1541 阅读
使用错误的默认值，会掩盖错误，又造成新的错误，最后将错误传入内部。
# 前台传入三个参数，三个参数都是必需的.
identifier = web.input().get("identifier", None) # webpy框架
year = web.input().get("year", None)
taxpayer_name = web.input().get("taxpayer_name", None)
# 传输如None参数，会导致接口出现错误
result = service.inquiryTaxOwe(identifier, year, taxpayer_name)
前台传入三个参数时，表现正常。
上面使用默认参数是demo阶段时为了方面。实现时会出现下面的情况.
如果人来用它，只传入部分参数，结果发现程序有异常(inquirytaxOwe函数内抛出的)。它会找到实现接口的人，告诉你你的程序有问题。这个时候你怎么解释？ 异常是里面一层抛出的，这一层可不管调用者的事，调用者只负责传参数，然后拿到结果。这时你会发现多么的郁闷。说不是你的责任，但是有你一分。说不是调用者的责任，实际也有它一分。
换一种方式
identifier = web.input().identifier year = web.input().year taxpayer_name = web.input().taxpayer_name result = service.inquirytaxOwe(identifier, year, taxpayer_name)
再不传入参数时，会及早发现，不会再有上面的郁闷了.
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