python_map.py #!/usr/bin/python def square(x): return x * x nums = [1, 2, 3, 4, 5] nums_squared = map(square, nums) for num in nums_squared: print(num) We define a list of integers and apply the square function on each element of the list with map. ...
如果您正在尝试上述代码,您可以对Polygon进行子类化,并覆盖__init__函数,而不是替换初始化器或复制add_point和perimeter方法。 然而,在面向对象和更注重数据的版本之间没有明显的赢家。它们都做同样的事情。如果我们有新的函数接受多边形参数,比如area(polygon)或point_in_polygon(polygon, x, y),面向对象代码的好处...
def add(a: int, b: int) -> int: """This function returns the sum of two integers.""" return a + b result = add(3, 4) print(result) # Output: 7 十一、装饰器 装饰器是一个高阶函数,它接受一个函数作为参数并返回一个新的函数。装饰器通常用于修改或扩展函数的行为,而不改变其定义。
| 代码:colors.extend(['purple','magenta'])``#values 'purple' and 'magenta' added at the end of the 'colors' list | 从列表中删除元素 正如有多种方法可以向列表中添加项目一样,也有多种方法可以从列表中删除值,如表 2-2 中所述。请注意,每种方法一次只能删除一个项目。 表2-2 从列表中删除...
nums = range(5) # range is a built-in function that creates a list of integersprint nums # Prints "[0, 1, 2, 3, 4]"print nums[2:4] # Get a slice from index 2 to 4 (exclusive); prints "[2, 3]"print nums[2:] # Get a slice from index 2 to the end; prints "[2, ...
map is commonly used for type conversion of sequence elements. This example converts strings to integers. type_map.py str_numbers = ["1", "2", "3", "4"] int_numbers = map(int, str_numbers) print(list(int_numbers)) # [1, 2, 3, 4] Here we use Python's built-in int ...
nums = range(5) # range is a built-in function that creates a list of integers print nums # Prints "[0, 1, 2, 3, 4]" print nums[2:4] # Get a slice from index 2 to 4 (exclusive); prints "[2, 3]" print nums[2:] # Get a slice from index 2 to the end; prints "[...
nums = range(5) # range is a built-in function that creates a list of integers print nums # Prints "[0, 1, 2, 3, 4]" print nums[2:4] # Get a slice from index 2 to 4 (exclusive); prints "[2, 3]" print nums[2:] # Get a slice from index 2 to the end; prints "[...
Although binary sequences are really sequences of integers, their literal notation reflects the fact that ASCII text is often embedded in them. Therefore, three different displays are used, depending on each byte value: For bytes in the printable ASCII range—from space to ~—the ASCII character...
We’ll create another example that usesmathematical operators,integers, and therange()sequence type. number_list=[x**2forxinrange(10)ifx%2==0]print(number_list) Copy The list that is being created,number_list, will be populated with the squared values of each item in the range from 0...