「四舍五入」是小学就学过的数学知识，也是日常计算中经常会用到的处理方法。 然而让人没想到的是，一个简单的四舍五入操作，在Python里居然这么难搞，网上还一堆错误的教程。 来看这个例子，有一个变量a为1.135，现在希望把它保留2位小数，要怎么做？
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