teachesusesDeveloper- name- experience+teachBeginner()Beginner- name+learn()PythonConversion+getStringInput()+checkIfDigit()+convertToFloat()+formatToTwoDecimals()+printResult() 在上面的类图中,Developer类表示经验丰富的开发者
FloatProcessor- num: float+round_to_two_decimals() : float+format_to_two_decimals() : str+floor_to_two_decimals() : float 旅行图 让我们用一个旅行图的示例来说明使用上述三种方法处理浮点数的过程: 使用round函数 FloatProcessor->FloatProcessor FloatProcessor->FloatProcessor FloatProcessor-->FloatP...
b=Decimal(1)/Decimal(3)bDecimal('0.33333333333333333333333333333333333333333333333333')c=Decimal(1)/Decimal(17)cDecimal('0.058823529411764705882352941176470588235294117647059')float(c)0.058823529411764705默认的context的精度是28位，可以设置为50位甚至更高，都可以。这样在分析复杂的浮点数的时候，可以有...
allkernels(twice to skip confirmation).Creatednewwindowinexisting browser session.To access the notebook,openthisfileina browser:file:///home/wesm/.local/share/jupyter/runtime/nbserver-185259-open.htmlOr copy and paste oneofthese URLs:http://localhost:8888/?token=0a77b52fefe52ab83e3c35dff8de...
The errors in Python float operations are inherited from the floating-point hardware, and on most machines are on the order of no more than 1 part in 2**53 per operation. That’s more than adequate for most tasks, but you do need to keep in mind that it’s not decimal arithmetic and...
!r —表示调用repr()函数来进行将值转换成字符串!s —表示调用str()函数来进行将值转换成字符串 >>> class Color: def __init__(self, r: float = 255, g: float = 255, b: float = 255): self.r = r self.g = g self.b = b def __str__(self) -> str: return...
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...
float和Decimal值的可用表示类型有: 示例 '{:20.4e}'.format(123.456789)'1.2346e+02''{:20.4E}'.format(123.456789)'1.2346E+02''{:20.4f}'.format(123.456789)'123.4568''{:20.4F}'.format(123.456789)'123.4568''{:20.4%}'.format(123.456789)'12345.6789%' ...
coerce_to_string 如果用于表示应返回字符串值,则设置为 True;如果应返回 Decimal 对象,则设置为 False。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 goods_price=serializers.DecimalField(max_digits=10,decimal_places=2,max_value=10000.00,min_value=0.00,coerce_to_string=False) ...
"数字类型:int, float, decimal.Decimal, fractions.Fraction, complex" "字符串类型:str, bytes" "元组:tuple" "冻结集合:frozenset" "布尔类型:True, False" "None" 不可hash类型:原地可变类型:list、dict和set。它们不可以作为字典的key。 1.2 动态类型简介 变量名通过引用,指向对象。Python中的“类型”属于...