比较运算

Comparisons

> >=

< <=

==

!=

is

is not

优先级 Priority

优先级相同，先来先算；比布尔运算高

更多信息，请访问 Python - comparisons

使用 Usage

一般操作

a = 5
if a > 0 and a < 9:
    print("a is greater than 0 and less than 9")

链式操作 - 推荐

a = 5
if 9 > a > 0:
    print("a is greater than 0 and less than 9")
if 0 < a < 9:
    print("a is greater than 0 and less than 9")