python def round_to_two_significant_digits(number): if number == 0: return 0 else: return round(number, 2 - int(math.floor(math.log10(abs(number))) import math number = 123.456 rounded_number = round_to_two_significant_digits(number) print(rounded_number) # 输出: 120 2. 使用 decim...
最后,我们需要测试函数以确保其正确性。 # 测试print(round_to_significant_digits(123.456789))# 应输出123.5print(round_to_significant_digits(0.00123456789))# 应输出0.001235print(round_to_significant_digits(-98765.4321))# 应输出-98770 1. 2. 3. 4. 类图 使用Mermaid语法的类图如下所示: Rounder+round_to...
那在我们的python中如何四舍五入?如何保留小数?用round函数就可以。 1、round函数 python的内置函数,用于数字的四舍五入。 2、round 负数 四舍五入是围绕着0来计算的 示例 round(0.5) # 1.0 round(-0.5) #-1.0 3、示例:保留两位小数代码 s = 1.23567 result = ro...
由于浮点数的内部表示方式并不能精确地表示所有的实数,因此在进行浮点数运算时,可能会出现一些舍入误差。 例如,我们可以使用round函数对浮点数进行四舍五入操作。然而,由于舍入误差的存在,这个函数可能会得到不符合我们预期的结果。下面的代码演示了这个问题: result=round(2.675,2)print(result) 1. 2. 运行上述代...
5. NumPy round significant digits Here, we will create a custom function to round a different number to a precise number of significant digits in Python. import numpy as np def round_to_significant_figures(num, sig_figs): if num != 0: ...
You can either call the cmath module’s exp() or raise the e constant to a power to get the same result: Python >>> import cmath >>> algebraic = 3 + 2j >>> geometric = complex(3, 2) >>> radius, angle = cmath.polar(algebraic) >>> trigonometric = radius * (cmath.cos(...
The difference becomes significant if the results are rounded to the nearest cent:>>> >>> from decimal import * >>> round(Decimal('0.70') * Decimal('1.05'), 2) Decimal('0.74') >>> round(.70 * 1.05, 2) 0.73 The Decimal result keeps a trailing zero, automatically inferring four ...
(1,3,1), plot_image(im, 'original') im1 = binary_opening(im, disk(12)) pylab.subplot(1,3,2), plot_image(im1, 'opening with disk size ' + str(12)) im1 = binary_closing(im, disk(6)) pylab.subplot(1,3,3), plot_image(im1, 'closing with disk size ' + str(6)) pylab...
print("pi to 4 significant digits = {:.4}".format(math.pi)) pi to 4 significant digits = 3.142 我们在模块中找到的大部分都是函数,比如 math.log: math.log(32, 2) 5.0 如果不了解 math.log有什么功能,可以调用help()函数: help(math.log) Help on built-in function log in module math...
Discover three techniques to round up numbers in Python: using Python round up methods like math.ceil() from the math module, the decimal module, and NumPy.