所以你可以在全局的列表或者字典里面添加、删除或者替换元素，但如果你要重新给这个全局变量赋值，就必须要声明了。

So you can add, remove and replace elements of a global list or dictionary, but if you want to reassign the variable, you have to declare it.

youdao

如果相应语句为某个表达式赋值，请用一个可写的变量、属性或数组元素替换该表达式。

If the statement assigns a value to an expression, replace the expression with a single writable variable, property, or array element.

youdao

如果相应语句为某个表达式赋值，请用一个可写的变量、属性或数组元素替换该表达式。

If the statement assigns a value to an expression, replace the expression with a single writable variable, property, or array element.

youdao