Otherwise, round m up. Finally, shift the decimal point back p places by dividing m by 10ᵖ. It’s an algorithm! For example, the number 2.5 rounded to the nearest whole number is 3. The number 1.64 rounded to one decimal place is 1.6. Now open up an interpreter session and round...
在这个示例中,123.5使用ROUND_HALF_UP模式舍入后得到124,而使用ROUND_HALF_DOWN模式舍入后得到123。这展示了两种模式在处理.5这样的中间值时的不同行为。 round Python内置的round函数和decimal模块中的Decimal类的quantize方法都可以用来进行数值的四舍五入,但它们在默认行为上有所不同,并且decimal模块提供了更多的灵...
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 types...
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 power minusndigits;if two...
Python Decimal 模块中的 ROUND_HALF_EVEN 和 ROUND_HALF_DOWN 在Python 中,Decimal 模块提供了高精度的十进制浮点数运算,可以避免浮点数计算时出现的精度丢失问题。Decimal 模块中有两种常用的舍入模式:ROUND_HALF_EVEN 和 ROUND_HALF_DOWN。这两种舍入模式对于处理浮点数的舍入操作非常有用。
print(round(3.447444, 2)) >>3.45 from decimal import Decimal print(Decimal('0.3') + Decimal('0.9')) >>1.2 import math #向上取
>>>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') ...
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 to 2 decimal places using the round() function The round() function is Python’s built-in function for rounding float point numbers to the specified number of decimal places. You can specify the number of decimal places to round by providing a value in the second argument. The example...
Method 1: The round( ) Function in Action As the name indicates, the round( ) function will return a floating point number to a specified number of decimals. Following is its syntax. round(number, digits) In the below example, we shall create a variable for storing the input number wi...