运算符

# 1.比较运算符
    #  >  <  >=  <=  ==(等于) != (不等于)

# 2.算术运算符
    # + - * /
    # //(整除|地板除(向下取整))
    # ** 幂
    # % 取余(模)
    # print(5 / 2)  # 2.5
    # print(5 // 2) # 2
    # print(2 ** 0) # 1
    # print(5 % 2)  # 1

# 3.赋值运算符
    #     =
    #     +=
    #     -=
    #     *=
    #     /=
    #     //=
    #     **=
    #     %= 
    # a = 10
    # b = 2
    # b += 1 # b = b + 1
    # print(b)
    # a -= 1  # a = a - 1
    # a *= 2  # a = a * 2
    # a /= 2  # a = a / 2
    # a //= 2 # a = a // 2
    # a **= 2 # a = a ** 2
    # a %= 2  # a = a % 2

# 4.逻辑运算符
    # 与(and 并且) 或(or) 非(not 不是)
    
    # True and False
    # True or False
    # True and not False
    # 优先级:() > not > and > or 
    # 查找顺序: 从左向右

# if 3>2 and 2>4:
#     print(1)

# 3>2 and 4>2 or True and not False and True
# 3>2 and 4>2 or True and True and True
# True and True or True and True and True
# True or True

# True和False进行逻辑运算时:
    # and:
        # 一真一假,就是假
        # 同真为真,同假为假

    # or:
        # 一真一假,就是真
        # 同真为真,同假为假

# 面试时 : 笔试题

    # and数字进行逻辑运算时:
    #     数字不为 0 时和不为 False
    #           and运算选择and后边的内容
    #           and运算都为假时选择and前的内容
    #           and 运算一真一假选择假

    # or 数字进行逻辑运算时:
    #     数字不为 0 时和不为 False
    #           or运算选择or前边的内容
    #           or运算都为假时选择or后边的内容
    #           or 运算一真一假选择真

    # print(1 and 3)
    # print(0 and 8)
    # print(9 and 4)
    # print(False and 5)

    # print(1 and 5)
    # print(3 and 1)
    # print(0 and False)

    # print(1 or 5)
    # print(5 or 9)
    # print(5 or 0)
    # print(False or 0)
    # print(False or True)
    # print(9 or True)

# if user == "aelx" and pwd == "alex123" and  or and:

# 5.成员运算法
    # in(在)    not in(不在)

    # name = "alex"
    # msg = input(">>>")
    # if name in msg:
    #     print(111)
    # else:
    #     print(222)