# All numbers less than 2 are not prime: if num < 2: return False # See if num is divisible by any number up to the square root of num: for i in range(2, int(math.sqrt(num)) + 1): if num % i == 0: return False return True def primeSieve(sieveSize): # Returns a list...
我们可以将该类加载到 Python 3 解释器中,这样我们就可以交互式地使用它。为了做到这一点,将前面提到的类定义保存在一个名为first_class.py的文件中,然后运行python -i first_class.py命令。-i参数告诉 Python运行代码然后转到交互式解释器。以下解释器会话演示了与这个类的基本交互: >>>a = MyFirstClass()>>>...
这样可以方便记录程序的版本变更和更新历史。 功能描述:可以通过注释的方式在题头中简要描述程序的功能,例如# Description: This program calculates the square root of a given number。这样可以帮助其他开发者理解代码的主要功能。 请注意,在Python中题头并非强制要求,在一些简单的脚本或示例代码中,可能并不包含题头。
SILENT_MODE = False # If set to True, program doesn't print anything. NONLETTERS_PATTERN = re.compile('[^A-Z]') def main(): # Instead of typing this ciphertext out, you can copy & paste it # from https://www.nostarch.com/crackingcodes/: ciphertext = """Adiz Avtzqeci Tmzubb...
The latter range is based on the fact that a composite number must have a factor less than or equal to the square root of that number. Otherwise, the number is prime. You can change the value of variable num in the above source code to check whether a number is prime or not for ...
Here is a "recipe" for deducing a square root of a number X-attributed to Heron of Alexandria in the first century AD 1.Sart with a guess, called g 2.If g*g is close enough to X, stop and stay that g is the answer 3.Otherwise make a new guess, by averaging g and X/g ...
""" self.num_layers = len(sizes) self.sizes = sizes self.default_weight_initializer() self.cost=cost def default_weight_initializer(self): """Initialize each weight using a Gaussian distribution with mean 0 and standard deviation 1 over the square root of the number of weights connecting ...
Let’s try out the square root function. 要使用它,我键入math.sqrt,输入参数是我希望平方根取的数字。 To use that, I type math.sqrt and the input argument is the number that I want the square root to be taken of. 在本例中,我要求Python返回10的平方根值。 So in this case, I’ve aske...
Raising a number to the power of 0.5 is the same as taking the square root, but notice that even though the square root of 9 is an integer, Python returns the float 3.0.For positive operands, the ** operator returns an int if both operands are integers and a float if any one of ...
也许说明这一点最简单的方法是用一个使用形状的例子。在这个例子中,形状是一类对象。那个类有相关的值,比如name和numberOfSides。那个类也有相关的方法,比如findArea或者findPerimeter。shape类有子类,更具体。正方形是一个shape对象,其值shapeType等于square,numberOfSides等于4。它的findArea方法获取lengthOfSides值并...