no和none的用法: no是形容词,只能作定语表示,意思是“没有”,修饰可数名词 (单数或复数)或不可数名词。如:There is no time left. Please hurry up. (没有时间了,请快点) / They had no reading … · 这个其实在Python文档当中有写了,为了准确起见,我们先引用Python文档当中的原文: In the context of Boolean operations, and also when expressions are used by control … · Python 3 中新的语法,请看 4. More Control Flow Tools 和 PEP 484 -- Type Hints