逻辑运算

逻辑运算

在没有()的情况下not 优先级高于 and，and优先级高于or，
即优先级关系为( )>not>and>or，同一优先级从左往右计算。

# 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    
# (not 2>1 f)

非0转换成布尔值为T，0位F
print(bool(-2))#T
x or y, x为真，值就是x，x为假，值是y；
x and y, x为真，值是y, x为假，值是x。

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