问题描述
我想格式化最多包含 2 个小数位的浮点数列表.但是,我不想要尾随零,也不想要尾随小数点.
I want to format a list of floating-point numbers with at most, say, 2 decimal places. But, I don't want trailing zeros, and I don't want trailing decimal points.
例如,4.001 => 4, 4.797 => 4.8, 8.992 => 8.99, 13.577 => 13.58.
So, for example, 4.001 => 4, 4.797 => 4.8, 8.992 => 8.99, 13.577 => 13.58.
简单的解决方案是('%.2f' % f).rstrip('.0')('%.2f' % f).rstrip('0').rstrip('.').但是,这看起来相当丑陋,而且似乎很脆弱.任何更好的解决方案,也许有一些神奇的格式标志?
The simple solution is ('%.2f' % f).rstrip('.0')('%.2f' % f).rstrip('0').rstrip('.'). But, that looks rather ugly and seems fragile. Any nicer solutions, maybe with some magical format flags?
推荐答案
需要将0和.分开剥离;这样你就永远不会剥离自然的 0.
You need to separate the 0 and the . stripping; that way you won't ever strip away the natural 0.
或者,使用 format() 函数,但这实际上归结为同一件事:
Alternatively, use the format() function, but that really comes down to the same thing:
format(f, '.2f').rstrip('0').rstrip('.')
一些测试:
>>> def formatted(f): return format(f, '.2f').rstrip('0').rstrip('.') ... >>> formatted(0.0) '0' >>> formatted(4.797) '4.8' >>> formatted(4.001) '4' >>> formatted(13.577) '13.58' >>> formatted(0.000000000000000000001) '0' >>> formatted(10000000000) '10000000000'