第六章（4）：Python的函数———作用域（scope）

作用域

Python has two types of function scope：

1.Local Scope:

• Variables defined within a function are considered to be in the local scope of that function.
• These variables are not accessible outside of the function.
• They only exist during the execution of the function and are deleted once the function finishes executing.

2.Global Scope:

• Variables defined outside of any function are considered to be in the global scope.
• These variables are accessible from anywhere within the program.
• They exist for the entire lifetime of the program.

When a variable is accessed within a function, Python first looks for it in the local scope. If it is not found in the local scope, Python then looks for it in the global scope.

所谓作用域，就是一个变量可被访问的范围。，通常情况下，一个变量的作用域是由其在代码中被赋值的位置决定的。