python怎么输出浮点数

Question

如题所述

Answer 1

方法>>> import math
>>> math.pi
3.141592653589793
>>> '%f'%math.pi
'3.141593'
>>> '%.30f'%math.pi
'3.141592653589793115997963468544'
>>> print '%.30f'%math.pi
3.141592653589793115997963468544

Answer 2

float(123)
float('123')