运算符

Posted 2021-03-08 chaxiaoming

# and or not
# and:两边都是ture ,才是ture,只要有一个是false,结果是false
# 优先级：（）>not>and>or

# print(2 > 1 and 1 < 4 or 2 < 3 and 9 > 6 or 2 < 4 and 3 < 2)

‘‘‘x or y x为非零（True)，则返回x‘‘‘
#ps int  转换成bool 非零转换成  bool 是frue， 0 转换成bool 是 False
# print(bool(2)) #True
# print(bool(-2)) #True
# print(bool(0)) #False
# #bool ---> int
# print(int(True)) #1
# print(int(False)) #0

# 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 x为非零（True)，则返回Y"""
#print(1 and 2) #2
#print(0 and 2) #0

print(0 or 4 < 3) # False
print(2 or 4 < 3) # 2
print(2 or 2 < 3) # 2
print(0 or 2 < 3) # True
print(3 > 2 or 0 and 2) #课后题 True
print(3 > 4 or 0 and 2) #课后题 0