python built-in functions can be modified in the external environment variables

python built-in functions can be modified in the external environment variables

The key is if the details are simple variable type, but not if it is a container class variables, then no problem...
The following code:

class G:
    pass
def f():
    a=11
    b=22
    x=[1, 2, 3]
    g=G()
    g.abc=2
    def iner():
        global c # 如果想要把内部变量传递到外部环境里, 就必须先在内部函数里声明为全局变量
        c=a+b
        # b *=100  # 内部函数不能修改 简单型外部变量
        
        x.append([4,5,6]) # 但是可以修改容器类外部变量, 比如list型的
        print('x=', x)
        print(a,b,c)
        print(x)
        
        g.abc=200
        g.x=555
        print(g.abc)
    iner()
    print(a,b,c)
    print(x)
    print(f'g.abc={g.abc}')
    print(g.x)
    

operation result:

f()

x= [1, 2, 3, [4, 5, 6]]
11 22 33
[1, 2, 3, [4, 5, 6]]
200
11 22 33
[1, 2, 3, [4, 5, 6]]
g.abc=200
555