1）优先级 ()> not > and > o r
and：真真为真，真假为假 ，假假为假
or：真真为真，真假为真，假假为假
print(2 > 1 and 1 < 4) #and两边都为真，所以输出为真（） print(2 > 1 and 1 < 4 or 2 < 3 and 9 > 6 or 2 < 4 and 3 < 2) #先计算所有and，结果为真、假、假，or因为真假为真，所以输出为真
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 非零转换成bool True 0 转换成bool 是False
2）x or y 如果x True，则返回x，如果x False，则返回y
print(1 or 2) # 1 print(3 or 2) # 3 print(0 or 2) # 2 print(0 or 100) # 100
print(2 or 100 or 3 or 4) # 2
x and y 如果x Ture，则返回y，如果 x False，则返回x
print(1 and 2) #2 print(0 and 2) #0 print(2 or 1 < 3) #2 print(3 > 1 or 2 and 2) #Ture