python while中使用else语句

'''
while 表达式:
    语句1
else:
    语句2
逻辑：在条件语句(表达式)为False时执行else中的“语句2”
'''
a = 1
while a <= 3:
    print("sunck is a good man!")
    a += 1
else:
    print("very very good")
print("you are right")