基本运算符

1. 算术运算符
 + - * /   % ** // 
2. 比较运算符
    == != > < >= <=
3. 赋值运算符 =
4. 增量赋值
# 增量赋值
n = 666
n = n + 1  # n += 100
n = n - 1  # n -= 1
n = n * 1  # n *= 1
n = n / 1  # n /= 1
print(n)  # 667
5. 链式赋值
x = 10
y = 10
z = 10
print(x, y ,z)

x = y = z = 10
print(x, y, z)
6. 交叉赋值
# 交换m，n的值
# m = n
# n = m
# print(m, n)
# 借助于第三个变量
# temp = m
# m = n
# n = temp
# print(m, n)

m, n = n, m
print(m, n)

7. 解压赋值

# l, l1, l2, l3 = names_list
# l, l1, l2, l3 = ['kevin', 'jack', 'rose', 'tank', ]
# print(l, l1, l2, l3)

# l, *_, l3 = ['kevin', 'jack', 'rose', 'tank', ]

# print(l)
# print(l3)
# '''
#     *后面的变量名结束多余的变量值，并且组装成列表的形式返回
# '''
# print(_)  # ['jack', 'rose']

# l, *_, last = ['kevin', 'jack', 'rose', 'tank', ]
# print(last)

8. 逻辑运算符
    and:与，连接两个条件，它的结果两边必须都是真，结果才是真
            >>>: 2 > 1 and 1 != 1 and True and 3 > 2
            False
            
    or：或，连接的两个条件，只要有一个是真，结果就是真
            >>>:2 > 1 or 1 != 1 or True or 3 > 2
             True
            
    not：非，取反
            >>>:  (3>4 and 4>3) or (1==3 and 'x' == 'x') or 3 >3
            True 
    not True--->False
    # 优先级not>and>or