Python常用运算符
Python支持多种运算符,下表大致按照优先级从高到低的顺序列出了所有的运算符,运算符的优先级指的是多个运算符同时出现时,先做什么运算再做什么运算。
运算符 | 描述 |
---|---|
[] [:] |
下标,切片 |
** |
指数 |
~ + - |
按位取反, 正负号 |
* / % // |
乘,除,模,整除 |
+ - |
加,减 |
>> << |
右移,左移 |
& |
按位与 |
^ \| |
按位异或,按位或 |
<= < > >= |
小于等于,小于,大于,大于等于 |
== != |
等于,不等于 |
is is not |
身份运算符 |
in not in |
成员运算符 |
not or and |
逻辑运算符 |
= += -= *= /= %= //= **= &= |= ^= >>= <<= |
(复合)赋值运算符 |
eg.赋值和复合赋值运算符,比较、逻辑和身份运算符
a = 10
b = 3
a += b # 相当于:a = a + b
a *= a + 2 # 相当于:a = a * (a + 2)
print(a)
flag0 = 1 == 1
flag1 = 3 > 2
flag2 = 2 < 1
flag3 = flag1 and flag2
flag4 = flag1 or flag2
flag5 = not (1 != 2)
print('flag0 =', flag0) # flag0 = True
print('flag1 =', flag1) # flag1 = True
print('flag2 =', flag2) # flag2 = False
print('flag3 =', flag3) # flag3 = False
print('flag4 =', flag4) # flag4 = True
print('flag5 =', flag5) # flag5 = False
print(flag1 is True) # True
print(flag2 is not False) # False