python打印浮点数_python – 打印整数或带有n位小数的浮点数

使用Python 3 *,您可以只使用

round(),因为除了舍入浮点数,当应用于整数时,它将始终返回一个int：

>>> num = 1.2345

>>> round(num,3)

1.234

>>> num = 1

>>> round(num,3)

1

帮助(float .__ round__)中记录了此行为：

Help on method_descriptor:

__round__(...)

Return the Integral closest to x, rounding half toward even.

When an argument is passed, work like built-in round(x, ndigits).

并帮助(int .__ round__)：

Help on method_descriptor:

__round__(...)

Rounding an Integral returns itself.

Rounding with an ndigits argument also returns an integer.

*使用Python 2,round()始终返回一个浮点数.