本文介绍了如何在python中加总位数(新格式)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想在python中保持浮点数的总数(小数点前后).
I would like to keep the total number of digits (before and after the decimal point) of a float constant in python.
例如，如果我要施加7的固定宽度:1234.567890123会成为1234.567但12345.678901234会成为12345.67
For example, if I want to impose a fixed width of 7:1234.567890123would become1234.567but12345.678901234would become12345.67
在这种情况下，固定小数位数无效，因为这取决于我在小数点之前有多少位数.我也尝试过[width]选项，但是它设置了最小宽度，我需要最大宽度.
Fixing the number of decimals does not work in this case since it depends on how many digits I have before the decimal point. I also tried the [width] option but it impose a minimum width and I need a maximum.
感谢您的输入！
推荐答案
只需使用您的示例，
a = 1234.567890123
b = 12345.678901234
str(a)[:8] # gives '1234.567'
str(b)[:8] # gives '12345.67'
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