运算符

运算符
        逻辑运算:
        and  并且的意思. 左右两端的值必须都是真. 运算结果才是真
        or   或者的意思. 左右两端有一个是真的. 结果就是真. 全部是假. 结果才能是假
        not  非的意思. 原来是假. 现在是真.  非真即假, 非假既真
    break   结束循环. 停止当前本层循环
    continue  结束当前本次循环. 继续执行下一次循环

# 计算机常用的数据
# print(2**0) # 1
# print(2**1) #2
# print(2**2)
# print(2**3)
# print(2**4)
# print(2**5)
# print(2**6)
# print(2**7)
# print(2**8)
# print(2**9)
# print(2**10)

# 赋值运算.
# a = 10
# a += 20     # a = a + 20
# print(a)

# print(not not not not not not False)

# and or not同时存在. 先算括号, 然后算not, 然后算and , 最后算or
# print(3>4 or 4<3  and  1==1) # False
#
# print(1 < 2  and  3 < 4 or 1>2  ) # T
# print(2 > 1  and  3 < 4 or 4 > 5 and  2 < 1)    # T
# print(1 > 2  and  3 < 4 or 4 > 5 and  2 > 1  or 9 < 8) # F
# print(1 > 1  and  3 < 4 or 4 > 5 and  2 > 1  and  9 > 8 or 7 < 6)
# print(not  2 > 1  and 3 < 4  or 4 > 5  and 2 > 1  and 9 > 8  or 7 < 6) # F
#
# x or y 如果x==0 那么就是y, 否则是x
# print(1 or 2)   # 1
# print(2 or 3)   # 2
# print(0 or 3)   # 3
# print(0 or 4)   # 4

# print(0 or 1 or 3 or 0 or 5)    #
# print(1 and 2)  # 2
# print(2 and 0)  # 0
# print(0 and 3)  # 0
# print(0 and 4)  # 0

# print(0 or 4 and  3 or 7 or 9 and  6)

# print(2 > 3 and 3)      # false相当于0
# print(2 < 1 and 4 > 6 or 3 and 4 > 5 or 6)

　　

转载于:https://www.cnblogs.com/w-y-z/p/9260515.html