python语言中三个奇妙的返回值详解编程语言

d = {} 
d[5] = "test1" 
d[5.0] = "test2" 
d["5"] = "test3" 
 
print(d[5]) 
print(d[5.0]) 
print(d["5"]) 
 
 
print(5 == 5.0) 
 
print(hash(5) == hash(5.0)) 
 
 
# python字段的key值是通过判定值是否相等和比较hash来判定两个键值是否相等 
 
# test2 
# test2 
# test3 
# True 
# True 
 
 
 
def test(): 
    try: 
        return "fun" 
    finally: 
        return "try" 
 
res = test() 
print(res) 
# try 
 
 
# 无论怎样 finally一定会执行，所以函数的返回值是最后一个return返回的值 
 
class test(object): 
    def __init__(self): 
        print("i") 
 
    def __del__(self): 
        print("d") 
 
 
print(test()  == test()) 
 
 
print(id(test()) == id(test())) 
 
 
# i 
# i 
# d 
# d 
# False 
# i 
# d 
# i 
# d 
# True