defround_to_two_decimal_places(number):return'{:.2f}'.format(number) 1. 2. 以上代码定义了一个名为round_to_two_decimal_places的函数,它接受一个数字作为输入,并返回保留两位有效数字并自动补0的结果。 示例 假设我们有一个数值列表[0.123, 1.234, 12.345, 123.456, 1234.567],我们希望将每个数值保留两...
>>> round(33.505, 2) 33.51 >>> round(Decimal("33.505"), 2) # This converts back to float (wrong) 33.51 >>> Decimal(33.505) # Don't init Decimal from floating-point Decimal('33.50500000000000255795384873636066913604736328125') Proper way to round financial values: >>> Decimal("33.505").q...
import decimal def round_up(x, place=0): context = decimal.getcontext() # get the original setting so we can put it back when we're done original_rounding = context.rounding # change context to act like ceil() context.rounding = decimal.ROUND_CEILING rounded = round(decimal.Decimal(str...
getcontext().rounding = getattr(decimal,'ROUND_FLOOR') # It sets the precision of the decimal module to 10. getcontext().prec =10 # Converting the integer 9 to a string and then converting it to a Decimal object. decimal_ = Decimal(1) / Decimal(str(9)) print('向下取整保留10位小数...
>>>TWOPLACES = Decimal(10) ** -2 # same as Decimal('0.01') >>># Round to two places >>>Decimal('3.214').quantize(TWOPLACES) Decimal('3.21') >>># Validate that a number does not exceed two places >>>Decimal('3.21').quantize(TWOPLACES, context=Context(traps=[Inexact])) ...
第二种,使用math库 如果就是不想赋值,也可以用math这个数学库来获取 import math pi = math.pi 第...
当我运行命令时 python manage.py migrate 我从postgresql 得到一个错误: A field with precision 10, scale 2 must round to an absolute value less than 10^8. 原文由 Mahammad Adil Azeem 发布,翻译遵循 CC BY-SA 4.0 许可协议 pythondjangopostgresqldjango-modelspostgresql-9.3 ...
通常使用 decimal 的方式是先导入该模块,通过 getcontext() 查看当前上下文,并在必要时为精度、舍入或启用的陷阱设置新值: >>>fromdecimalimport* >>>getcontext() Context(prec=28, rounding=ROUND_HALF_EVEN, Emin=-999999, Emax=999999, capitals=1, clamp=0, flags=[], traps=[InvalidOperation, Division...
Here’s the Python formula for calculating the distance between two points (along with Mile vs. Kilometer conversion) rounded to two decimal places. Credit to my son, Bill Karr, a Data Scientist forOpenINSIGHTS, for the code. from numpy import sin, cos, arccos, pi, round ...
_floor__(self):"""Finds the greatest Integral <= self."""raiseNotImplementedError@abstractmethoddef__ceil__(self):"""Finds the least Integral >= self."""raiseNotImplementedError@abstractmethoddef__round__(self, ndigits:Integral=None):"""Rounds self to ndigits decimal places, defaulting to 0...