python静态变量

# Python 中没有直接的静态变量概念，但可以通过多种方式实现类似的功能。

# 方法一：使用函数属性
def static_var(func):
    setattr(func, 'counter', 0)
    return func

@static_var
def my_function():
    my_function.counter += 1
    print(f"Function has been called {my_function.counter} times")

# 调用示例
my_function()  # 输出: Function has been called 1 times
my_function()  # 输出: Function has been called 2 times

# 方法二：使用类变量
class MyClass:
    class_var = 0  # 类变量，相当于静态变量

    def __init__(self):
        MyClass.class_var += 1
        print(f"Class variable value is now {MyClass.class_var}")

# 调用示例
obj1 = MyClass()  # 输出: Class variable value is now 1
obj2 = MyClass()  # 输出: Class variable value is now 2

# 方法三：使用 nonlocal 关键字（适用于嵌套函数）
def outer():
    counter = 0
    def inner():
        nonlocal counter
        counter += 1
        print(f"Inner function has been called {counter} times")
    return inner

inner_func = outer()
inner_func()  # 输出: Inner function has been called 1 times
inner_func()  # 输出: Inner function has been called 2 times