2.3.1. 关键字
以下标识符被作为语言的保留字或称 关键字,不可被用作普通标识符。关键字的拼写必须与这里列出的完全一致。
False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield