python 逻辑运算

Posted 2020-12-09 wangse

and or not

优先级，（）> not > and > or

print(3>4 or 4<3 and 1==1)  # F
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)  # F
print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F

ps int ---->bool 非0的数字转换bool值为True,0转换为bool值为False

print(bool(2))
print(bool(-2))
print(bool(0))
#bool --->int
print(int(True))   # 1
print(int(False))  # 0

x or y x为True 则返回x

 

print(1 or 2)  # 1
print(3 or 2)  # 3
print(0 or 2)  # 2
print(0 or 100)  # 100

x and y x True，则返回y

print(2 or 1 < 3)#2
print(3 > 1 or 2 and 4)#4