如何确保用户仅输入具有两位小数的 float 。该数字不能是 4 或 4.999,必须是 4.00 或 4.99,否则会出现错误。 while looping: try: number = float(input("Number: ")) string_number = (str(number)).split(".") check_length = len(string_number) if check_length != 2: print ("ERROR!") looping...
quantize(Decimal('0.01'))) Output: Area = 78.54 💡 Method 4: Using a Lambda Function This is a little hack to solve our problem using a lambda function. You can make the lambda function return the formatted value up to two decimal places, as shown in the solution below. Solution: 1...
对于一般浮点运算出现误差是因为底层CPU的浮点运算单元和IEEE 754浮点算术标准的一种特性。由于python的浮点数类型保存的数据采用的是原始表示形式,所以如果用到float实例就无法避免这些误差,如果,那么就要使用decimal模块了 在定义的时候就要使用 decimal模块的主要功能是允许控制计算机过程的各个方面,这包括数字的位数和四...
通过将这个格式化字符串作为format()方法的参数,可以得到格式化后的字符串。 方法三:使用Decimal对象 在Python中,还可以使用decimal模块的Decimal类来进行更精确的浮点数计算,并设置小数位数。下面是一个示例: fromdecimalimportDecimal,ROUND_HALF_UP num=Decimal(3.1415926)rounded_num=num.quantize(Decimal('0.00'),rou...
In these examples, you first use float() to convert an integer number into a float. Then, you convert a string into a float. Again, with strings, you need to make sure that the input string is a valid numeric value. Otherwise, you get a ValueError exception....
As shown in the picture below, the output generated in the cell is a Python float object this time, and is displayed automatically with nine decimal digits. So far so good, but if we inspect theFormat optionsof the cell, we may discover something interesting. Despite the output generated be...
This ends in a 5, so you then round the first decimal place away from zero to 1.6.In this section, you’ve only focused on the rounding aspects of the decimal module. There are numerous other features that make decimal an excellent choice for applications where the standard floating-point ...
You can also specify text alignment using the greater than operator:>. For example, the expression{:>3.2f}would align the text three spaces to the right, as well as specify a float number with two decimal places. Conclusion In this article, I included an extensive guide of string data typ...
例如:float_1 = 10.5是属于Float字面量。 字符串字面量是由引号括起来的一系列字符。我们可以对字符串使用单引号,双引号 或 三引号。并且,字符字面量是用单引号或双引号引起来的单个字符。例如:strings = "This is Python"。 布尔字面量。布尔字面量可以具有两个值中的任何一个:True 或False。例如:a = ...
how do you get a float variable to round the decimal to two decimal places in python3 I'm having a bit of trouble with this and I have no idea what to do pythonpython3 9th Jan 2019, 7:43 PM Austin 4 Answers Sort by: Votes Answer ...