from decimal import Decimal, ROUND_HALF_UP, ROUND_HALF_DOWN, ROUND_CEILING number = Decimal('3.14159') 四舍五入 rounded_number = number.quantize(Decimal('0.1'), rounding=ROUND_HALF_UP) print(rounded_number) # 输出:3.1 五舍六入 rounded_number = number.quantize(Decimal('0.1'), rounding=RO...
round(), for rounding numbers to some number of decimal places abs(), for getting the absolute value of a number pow(), for raising a number to some powerYou’ll also learn about a method you can use with floating-point numbers to check whether they have an integer value....
self.value = self.value.quantize(Decimal('1e'+str(self.lowest_digit)), ROUND_HALF_EVEN) self.effective_digits = precision self.debugger(f"{old_val} --> {self.value} (rounding to 1e{self.lowest_digit}, effectives={precision})") def round(self, precision:int = 1): """舍入。\n ...
getcontext().rounding = ROUND_HALF_EVEN # 默认 print('ROUND_HALF_EVEN') print(Decimal('15.255').quantize(Decimal('1'))) # 15 print(Decimal('15.255').quantize(Decimal('1.0'))) # 15.3 print(Decimal('15.255').quantize(Decimal('1.00'))) # 15.26 # 四舍五入,趋近于零 getcontext().rou...
control over rounding to meet legal or regulatory requirements, tracking of significant decimal places, or applications where the user expects the results to match calculations done by hand.For example, calculating a 5% tax on a 70 cent phone charge gives different results in decimal floating po...
，再根据小数位置值，对number类型的数据右边的低位进行四舍五入（如果小数位置值为负的，如何处理？）
(values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice) 同时,float类型采用双精度二进制存储(参照IEEE754标准),round函数使用的是二进制存储值,在舍入时会对结果产生影响,而round本身没有使用四舍五入...
n =int(input("Enter any number"))foriinrange(1,100):ifi == n:print(i)break O(n²): 这个符号指定了与输入数据的平方大小成正比的算法的性能。在嵌套循环中非常常见。 还有一些其他符号,比如O(2^N)和O(log N),但我们不需要再深入了解,因为我们已经学到足够多,可以区分好的代码和坏的代码。
Numbers with infinite decimal expansions cause rounding errors when stored as a floating-point data type in computer memory, which itself is finite. To make matters worse, it’s often impossible to exactly represent numbers with terminating decimal expansion in binary! That’s known as the floating...
rounding towards negative infinity (also known as rounding down orfloor).Example of rounding to ...