Python Late Binding Explained

Late Binding in Python refers to variables inside a function being bound when the function is called, rather than when it is defined. This allows variables within the function to include variables from an external scope, not just function parameters.

延迟绑定在函数内部嵌套函数中发生，具体表现为内部函数在引用变量时首先在自己的作用域中查找，如果找不到则继续在外部函数的作用域中查找。这种行为是动态的，即在运行时进行。

One important feature of delayed binding is that inner functions can access local variables of outer functions and still access these variables even after the outer function returns. This feature allows inner functions to “remember” the state of outer functions and continue to use this state after the outer function ends.

Delay binding is found in various applications in actual programming, such as decorators and closures. By employing delayed binding, more flexible and powerful programming techniques can be achieved.