Python 3.2 Official Document translations: scopes and Namespace instances

The following examples are primarily used to demonstrate how different scopes and namespaces are referenced, and how the keyword global and nonlocalru affect the binding of variables.

The results of the instance run are:

After the local assignment:test spam

After nonlocal assignment:nonlocal spam

After global assignment:nonlocal spam

In global scope:global spam

Note that local assignment (which is the default) cannot change the binding value of the spam in the Scope_test method. But a nonlocal assignment can change its value. Global variable assignments can only change values at the same level as the module.

You can see that the spam binding value is not given before the global variable is assigned a value.

Back to the column page: http://www.bianceng.cnhttp://www.bianceng.cn/Programming/extra/