int_num = 10 float_num = float(int_num)四舍五入 可以使用round()函数对Float变量进行四舍五入操作。例如：num = 3.14159 rounded_num = round(num, 2) 数学运算 可以对float变量进行各种数学运算，如加、减、乘、除等。例如：a = 3.14 b = 2.71828 print(f'a + b = {a+b}')print...
Round Float to Decimals Write a Python program to round a floating-point number to a specified number of decimal places. Sample Solution: Round to specified Decimals using %f Function: Python Code: # Define the order amount as a floating-point number.order_amt=212.374# Print the total order...
Python提供了一些内置函数和方法来处理浮点数，例如abs()、round()、math模块等。示例：import mathx = -3.14y = abs(x) # 取绝对值z = round(x) # 四舍五入a = math.floor(x) # 向下取整b = math.ceil(x) # 向上取整print(y, z, a, b) # 输出结果为3.14 -3 -4 -3 5. 浮点...
复数通过complex(real, imag)函数来指定,或者通过浮点数再加上后缀j来指定。 >>> a = complex(2, 4) # (2+4j) >>> b = 3 - 5j >>> a.real, a.imag, a.conjugate() # 实部、虚部以及共轭值 求正弦、余弦或平方根使用cmath模块 >>> cmath.sin(a), cmath.cos(a), smath.exp(a) 七、...
NoteThebehavior of round()forfloats can be surprising:forexample,round(2.675,2)gives2.67instead of the expected2.68.Thisisnota bug:it’s a result of the fact that mostdecimalfractions can’t be represented exactlyasafloat.SeeFloatingPointArithmetic:IssuesandLimitationsformore information. ...
Python内置的实数类型是float,把一个float类型的实数转换为Decimal高精度实数,可以查看实际值的更多位数,然后再按照“四舍六入五成双”或“四舍六入五凑偶”的规则理四舍五入就容易了。例如: 从上面的代码可以看出,1.275、1.285、1.295这样的数字在内存中实际存储的值都比原来的值略小一点,所以保留2位小数时第3...
round()内置方法 用round()内置的方法来取小数点的精度是最常用的。 当round(float)只包含数字的时候,默认保留1位小数,采用四舍五入的方式。 例子如下: >>> round(2.5) 3.0 >>> round(1.5) 2.0 a = 3.00 b = 2.53 c = 2.43 print(round(a)) ...
The behaviorofround()forfloats can be surprising:forexample,round(2.675,2)gives2.67insteadofthe expected2.68.This is not a bug:it’s a resultofthe fact that most decimal fractions can’t be represented exactlyasa float.See Floating Point Arithmetic:Issues and Limitationsformore information. ...
The behavior of round() for floats can be surprising: for example, round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: it’s a result of the fact that most decimal fractions can’t be represented exactly as a float. See Floating Point Arithmetic: Issues and ...
round(a,2) ‘%.2f’ % a Decimal(‘5.000’).quantize(Decimal(‘0.00’)) 当需要输出的结果要求有两位小数的时候,字符串形式的:’%.2f’ % a 方式最好,其次用Decimal。 需要注意的: 可以传递给Decimal整型或者字符串参数,但不能是浮点数据,因为浮点数据本身就不准确。