There is a story that salesmen like to tell you: if you buy everypiece of your system from them, you'll get excellent support becausethere's only one vendor involved. One set of people who knoweverything, one place to contact, and there'll never be finger-pointback and forth about whose fault something going wrong is.
This is a myth. Let's look at the reality.
Let's say that you want some front-end servers all talking to a big
軟件
好設計
看了 关于rss博览是否侵权的一点补充 一文，其實我自己也有同樣的疑問。
曾經看過有一個網站，有一些 RSS 的收錄，然而跟一般的 Blog 不一樣，他不只列表文章連結，而是取了 RSS 的整個內容，然後貼一個 RSS 匯集的專區，看上去就好像
I just helped someone whose Fedora Core 3 installation was producingthe following error message:
# yum check-updateSetting up repositoriesCannot find a valid baseurl for repo: updates-released
This is a beautiful example of a Unix tendency that people gripeabout: technically correct but completely useless error messages.While yum is correctly complaining that it cannot generate a valid URLfor the 'updates-released' RPM repository, it would be much moreuseful if it told us why, with an error message such as:
Cannot fetch
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Exceptions have somewhat of a bad reputation in serious programmingcircles. People feel that they are troublesome for various reasons,including that they are non-local gotos and they make it hard toguarantee that you really are cleaning up after problems. (You canfind posts about this at Joel on Software and in Raymond Chen's blog,among other places.)
I don't know about that, but I do know that exceptions are really goodfor casual programs, which is what I mostly write. Casual programs
Python likes to make programming efficient: that is, to make programsfast and easy to write, and eliminate the tedious drudgery. Prettymuch all dynamically typed languages do, since static typing is a lotof effort (except in languages with a lot of type inference, where itis only some effort).
After writing yesterday's entry ,it's struck me that exceptions are a form of efficientprogramming, because they let you aggregate error checking and errorhandling across a large block of code.
Without exceptions
