格式化浮点数而不尾随零 [英] Formatting floats without trailing zeros

问题描述

如何格式化浮点数，使其不包含尾随零?换句话说，我希望结果字符串尽可能短.

How can I format a float so that it doesn't contain trailing zeros? In other words, I want the resulting string to be as short as possible.

例如:

3 -> "3"
3. -> "3"
3.0 -> "3"
3.1 -> "3.1"
3.14 -> "3.14"
3.140 -> "3.14"

推荐答案

我会做('%f' % x).rstrip('0').rstrip('.')-确保定点格式而不是科学计数法等.是的，不像%g，但是，它有效(而且我不知道如何强制%g永远不要使用科学计数法；-).

Me, I'd do ('%f' % x).rstrip('0').rstrip('.') -- guarantees fixed-point formatting rather than scientific notation, etc etc. Yeah, not as slick and elegant as %g, but, it works (and I don't know how to force %g to never use scientific notation;-).

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