python 浮点数保留几位小数

 

In [1]: a = 5.026

In [2]: b = 5.000

In [3]: round(a,2)
Out[3]: 5.03

In [4]: round(b,2)
Out[4]: 5.0

In [5]: \'%.2f\' % a
Out[5]: \'5.03\'

In [6]: \'%.2f\' % b
Out[6]: \'5.00\'

In [7]: float(\'%.2f\' % a)
Out[7]: 5.03

In [8]: float(\'%.2f\' % b)
Out[8]: 5.0