python保存两位小数的几种方法，python2保留小数

>>> x = 3.1415926>>> print("%.2f" % x)3.14>>>

>>> x = 3.1415926>>> round(x, 2)3.14>>>

def round(number, ndigits=None): # real signature unknown; restored from __doc__
    """ round(number[, ndigits]) -> number Round a number to a given precision in decimal digits (default 0 digits). This returns an int when called with one argument, otherwise the same type as the number. ndigits may be negative. """
    return 0

>>> from decimal import Decimal
>>> x = 3.1415926
>>> Decimal(x).quantize(Decimal("0.00"))
Decimal('3.14')
>>> a = Decimal(x).quantize(Decimal("0.00"))
>>> print(a)
3.14
>>> type(a)
<class 'decimal.Decimal'>
>>> b = str(a)
>>> b
'3.14'

>>> x = 3.1415926
>>> str(x).split(".")[0] + "." + str(x).split(".")[1][:2]
'3.14'

>>> import re
>>> x = 3.1415926
>>> re.findall(r"\d{1,}?\.\d{2}", str(a))
['3.14']

from __future__ import division
import os

print(2/3)