round函数的行为可以通过指定第二个参数ndigits来控制舍入的位数,但舍入模式默认是ROUND_HALF_TO_EVEN(即“银行家舍入法”)。 decimal模块中的Decimal类和quantize方法 decimal.Decimal类的quantize方法默认遵循ROUND_HALF_UP舍入模式,即当要舍入的数字正好在两个可舍入的数字中间时,它会
importdecimalprint(decimal.Decimal(2.675))# `输出 2.67499999999999982236431605997495353221893310546875` 所以,round(2.675, 2)实际上相当于round(2.67499999999999982236431605997495353221893310546875, 2),对于 2.674999... 这个数,取小数点后保留2位的数值,按照“四舍六入五取偶”的原则,小数点后第3位实际存储在计算机中的...
The number 1.64 rounded to one decimal place is 1.6. Now open up an interpreter session and round 2.5 to the nearest whole number using Python’s built-in round() function: Python >>> round(2.5) 2 Gasp! Check out how round() handles the number 1.5: Python >>> round(1.5) 2 ...
print(round(3.447444,2))>>3.45 fromdecimalimport Decimal print(Decimal('0.3') + Decimal('0.9'))>>1.2 importmath#向上取整math.ceil( x )importmath#向下取整math.floor( x )
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. """return0 3、使用python内置的decimal模块
>>>from decimal import * >>>getcontext() Context(prec=28, rounding=ROUND_HALF_EVEN, Emin=-999999, Emax=999999, capitals=1, clamp=0, flags=[], traps=[InvalidOperation, DivisionByZero, Overflow]) >>>Decimal('5')/3 Decimal('1.666666666666666666666666667') ...
import decimal #Can be rounded to 13.48 or 13.49 rounded = round(13.485, 2) print(rounded) Let’s see the output for this program: The number in program can be rounded to 13.48 or 13.49. By default, the round(...) function rounds down. This can be changed as well: import decimal...
How do you round a value to two decimal places in Python? That’s an excellent question. Luckily for you, Python offers a few functions that let you round numbers. Rounding numbers to two decimal places is common. Money only uses two decimal places; you do not want to process a ...
called with one argument, otherwise of the same type as number.NoteThe behavior of round() for floats can be surprising: for example, round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: it’s a result of the fact that most decimal ...
UseMidpointRoundingwith appropriate overloads ofMath.Round,MathF.Round, andDecimal.Roundto provide more control of the rounding process. There are two overall rounding strategies, round to nearest and directing rounding, and each enumeration field participates in exactly one of these strategies. ...