如何从静态 属性 引用静态方法

Question

我正在尝试从字典中调用函数 - operation_functions

• key 是数学运算的名称
• 值是计算器 class 中执行数学运算的静态方法

当我尝试引用 operation_functions 中的函数时，它告诉我“未定义计算器”

我只想知道在同一个 class

中引用静态方法和静态 属性 的 pythonic 方式是什么

class Calculator:
    """ This is the Calculator class"""

    operation_functions = {
        "addition": Calculator.add_number,
        "subtraction": Calculator.subtract_number,
        "multiplication": Calculator.multiply_number,
        "division": Calculator.divide_number,
    }

    @staticmethod
    def calculate_numbers(operation, *vals):
        """ will call respective calculation functions based on operation """
        function = Calculator.operations[operation]
        return function(*vals)

    @staticmethod
    def add_number(*vals):
        """ performs addition and returns resulting value """
        History.add_addition_calculation(*vals)
        return Calculator.get_last_result()

Answer 1

在创建 class 后分配 operation_functions 以便您可以引用 class 名称。

class Calculator:
    """ This is the Calculator class"""

    @staticmethod
    def calculate_numbers(operation, *vals):
        """ will call respective calculation functions based on operation """
        function = Calculator.operations[operation]
        return function(*vals)

    @staticmethod
    def add_number(*vals):
        """ performs addition and returns resulting value """
        History.add_addition_calculation(*vals)
        return Calculator.get_last_result()

Calculator.operation_functions = {
    "addition": Calculator.add_number,
    "subtraction": Calculator.subtract_number,
    "multiplication": Calculator.multiply_number,
    "division": Calculator.divide_number,
}