將浮點數限制爲兩位小數 - Limiting floats to two decimal points

問題：

I want a to be rounded to 13.95 . 我但願將a舍入爲13.95 。

>>> a
13.949999999999999
>>> round(a, 2)
13.949999999999999

The round function does not work the way I expected. round功能不能按我預期的方式工做。

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解決方案：

參考一： https://stackoom.com/question/1uWa/將浮點數限制爲兩位小數
參考二： https://oldbug.net/q/1uWa/Limiting-floats-to-two-decimal-points