运算符
运算符
and: 并且, 两端同时为真. 结果才能是真
or: 或者, 有一个是真. 结果就是真
not: 非真既假, 非假既真
顺序: () => not => and => or
x or y:
如果x是零, 输出y
如果x是非零, 输出x
True: 非零
False: 零
print(3>4 or 4<3 and 1==1) # False print(1 < 2 and 3 < 4 or 1>2 ) # True print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1) # True print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8) # False print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # False print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # False # x or y 如果x是0 返回y, 如果x是非零, 返回x print(1 or 2) # 1 print(1 or 0) # 1 print(0 or 1) # 1 print(0 or 2) # 2 print(0 or 1 or 2 or 3) print(3 or 0 or 1 or 0 or 2) # and和or相反. 不要去总结and. 记住or print(1 and 2) # 2 print(0 and 2) # 0 print(1 and 0) # 0 print(0 and 1) # 0 print(1 and 2 or 3) print(1 or 2 and 3) # False: 0, True: 1(非零) print(1 and 2>3) print(2>3 and 1) print(1 > 2 or 0 and 3 < 6 or 5) # 先算and 后算or