Example 1: Add Two Numbers # This program adds two numbers num1 = 1.5 num2 = 6.3 # Add two numbers sum = num1 + num2 # Display the sum print('The sum of {0} and {1} is {2}'.format(num1, num2, sum)) Run Code Output The sum of 1.5 and 6.3 is 7.8 The program belo...
"""Adds two numbers.""" return a + b print(add.__name__) # 输出:"add" print(add.__doc__) # 输出:"Adds two numbers." 在这个例子中,使用functools.wraps(original_function)装饰wrapper函数,确保了原函数add的元信息得到保留。 3.2 无参装饰器的编写与实践 3.2.1 实现常见的功能增强装饰器3.2....
我还使用pytest为一些较大的示例编写了单元测试——我发现它比标准库中的unittest模块更易于使用且功能更强大。你会发现,通过在操作系统的命令行 shell 中键入python3 -m doctest example_script.py或pytest,可以验证本书中大多数代码的正确性。示例代码仓库根目录下的pytest.ini配置确保 doctests 被pytest命令收集和...
Note: Amicable numbers are two different numbers so related that the sum of the proper divisors of each is equal to the other number. (A proper divisor of a number is a positive factor of that number other than the number itself. For example, the proper divisors of 6 are 1, 2, and ...
#Create a function to build a regression model with parameterized degree of independent coefficientsdefcreate_model(x_train,degree): degree+=1X_train = np.column_stack([np.power(x_train,i)foriinrange(0,degree)]) model = np.dot(np.dot(np.linalg.inv(np.dot(X_train.transpose(),X_train...
Yikes! The internal representation of this addition isn’t exactly equal to 3.3, as you can see in the final example. So, comparing x to 3.3 with the equality operator returns False.To compare floating-point numbers for equality, you need to use a different approach. The preferred way to ...
Python modules are libraries of code and you can import Python modules using the import statements. 让我们从一个简单的案例开始。 Let’s start with a simple case. 我们将通过说“导入数学”来导入数学模块。 We’re going to import the math module by saying "import math". 该模块具有多个功能。
Integers are used for representing whole numbers in Python. The numbers 5, 0, and -2 are examples of integers. Integers can be arbitrarily large in Python, so unlike some programming languages, representing numbers like 2**1000 (2 multiplied by itself 1,000 times) does not pose a problem....
print(f"Addition: {z1 + z2}") print(f"Subtraction: {z1 - z2}") print(f"Multiplication: {z1 * z2}") print(f"Division: {z1 / z2}") print(f"Exponentiation: {z1 ** 2}") ReadHow to Convert Decimal Numbers to Binary in Python?
Addition of numbers: (7+11j) Subtraction of numbers: (5+3j) Multiplication of numbers: (-22+31j) Division of numbers: (2-1j) Real numbers and imaginary numbers are calculated separately.You can also perform the exponential operation with the binary operator(**) but you can’t perform it...