原来Python2 的round()是四舍五入,而 Python3 的round()为四舍六入五成双,即高位为单数则进1凑成双数,高位为双数则不进位。 这让我想起了大二时候的大物实验,第一节讲的计数方法,其中印象最深刻的就是“四舍六入五成双”,它的作用是让统计数据更公平,降低舍入的误差。 具体查阅: 浮点算术:争议和限制 ...
Python Numbers 描述 round() 方法返回浮点数x的四舍五入值。 语法 以下是 round() 方法的语法: round( x [, n] ) 参数 x -- 数值表达式。 n -- 数值表达式,表示从小数点位数。 返回值 返回浮点数x的四舍五入值。 实例 以下展示了使用 round() 方法的实例: #!/usr/bin/python print "round(...
Python >>> from rounding import round_down >>> round_down(1.5) 1.0 >>> round_down(1.37, 1) 1.3 >>> round_down(-0.5) -1.0 The effects of round_up() and round_down() can be pretty extreme. By rounding the numbers in a large dataset up or down, you could potentially remove a...
Write a Python program to round every number in a given list of numbers and print the total sum multiplied by the length of the list. Visual Presentation: Sample Solution: Python Code: # Create a list 'nums' containing floating-point numbersnums=[22.4,4.0,-16.22,-9.10,11.00,-12.22,14.20,...
As you can see, once you understand the concept offloor()andceil(), rounding up or down is really easy. Rounding with string formatting in Python Finally, another way to round numbers is by using string formatting with the modulo%operator. This is our personal favorite method because it’s...
examples: >>> trueround(2.5, 0) == Decimal('3') True >>> trueround(2.5, 0, ROUND_DOWN) == Decimal('2') True number is a floating point number or a string type containing a number on on which to be acted. places is the number of decimal places to round to with '0' as ...
Argument 2 This tells how many numbers past the decimal point to keep. The final number is rounded up if the next digit is 5 or more. number = 1.23456 # Use round built-in. # ... This rounds up or down depending on the last digit. print(round(number)) print(round(number, 0)) ...
R round numbers 四舍五入 round(1.036315, digits=2) sprintf(“%.1f”,1.036315)
The number in program can be rounded to 13.48 or 13.49. By default, theround(...)function rounds down. This can be changed as well: import decimal #Can be rounded to 13.48 or 13.49 rounded = round(13.485, 2) print(decimal.Decimal(rounded).quantize(decimal.Decimal('0.00'), rounding=deci...
Get Your Code:Click here to download the free sample codeyou’ll use to learn about rounding numbers in Python.