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 ...
简介 python标准库的解释及翻译round(number[, ndigits])Return the floating point value number rounded to ndigits digits after the decimal point. If ndigits is omitted, it returns the nearest integer to its input. Delegates to number.__round__(ndigits).For the built-in...
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(number[,ndigits]) Return the floating point valuenumberrounded tondigitsdigits after the decimal point. Ifndigitsis omitted, it defaults to zero. Delegates tonumber.__round__(ndigits). For the built-in types supportinground(), values are rounded to the closest multiple of 10 to the ...
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
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...
第Python实现四舍五入的两个方法总结目录1、使用round2、使用Decimal最后的话 1、使用round 大多数情况下,我们会使用round来保留小数,但这并不符合我们在数学知识里的规则。 round(number[,ndigits]) round()把number(通常是浮点数)按如下规则(Python3)进行四舍五入的: 先说下ndigits不为0的情况: 如果保留...
round(number[,ndigits])Return the floating point valuenumberrounded tondigitsdigits after the decimal point. Ifndigitsis omitted, it returns the nearest integer to its input. Delegates tonumber.__round__(ndigits).For the built-in types supportinground(), values are rounded to the closest mul...
As the name implies, this can introduce a bias: if all the unrounded numbers had four decimal places, say, then in our example theexpectedaverage of the rounded numbers will be 0.0005 higher than that of the unrounded numbers. [edit] Round-to-even method ...
round([decimals, out]) Return a with each element rounded to the given number of decimals. searchsorted(v[, side, sorter]) Find indices where elements of v should be inserted in a to maintain order. setfield(val, dtype[, offset]) ...