Python返回内存指针位置而不是值

Question

我正在尝试创建一个 python 脚本，将当前 epoc 时间附加到字符串的末尾以创建迭代值。问题是 IDLE 吐出的是内存指针位置而不是值，我不知道为什么：

class dataGen:

    def epochTime(self):
            epoch_time = int(time.time())
            return epoch_time

    def firstName():
            firstName = 'Storm' + str(dataGen.epochTime)
            return firstName

    def lastName():
            lastName = 'Trooper' + str(dataGen.epochTime)
            return lastName 

def main():
    t = dataGen.firstName()
    t2 = dataGen.lastName()        
    print(t, t2)

if __name__ == '__main__':
    main()

输出：

Storm<function dataGen.epochTime at 0x0340A150> Trooper<function dataGen.epochTime at 0x0340A150>

如果我把它从课堂上拿出来，让它成为一个全局变量，它就可以工作：

epoch_time = int(time.time())   

class dataGen:

        def firstName():
                firstName = 'Storm' + str(epoch_time)
                return firstName

        def lastName():
                lastName = 'Trooper' + str(epoch_time)
                return lastName 

def main():
        t = dataGen.firstName()
        t2 = dataGen.lastName()        
        print(t, t2)

if __name__ == '__main__':
        main()

输出：

Storm1458766044 Trooper1458766044

Answer 1

您实际上并没有调用 epoch_time 函数：

def firstName():
        firstName = 'Storm' + str(dataGen.epochTime)
        return firstName

当你这样做时会看到不同之处：

def firstName():
        firstName = 'Storm' + str(dataGen.epochTime())
        return firstName

（注意dataGen.epochTime() 后面的括号）

和这个完全一样：

>>> def f():
...     return 100
...
>>> f
<function f at 0x107d687d0>
>>> f()
100
>>>

Answer 2

尝试：

class dataGen:

    def epochTime(self):
        epoch_time = int(time.time())
        return epoch_time

    def firstName(self):
        firstName = 'Storm' + str(self.epochTime())
        return firstName

    def lastName(self):
        lastName = 'Trooper' + str(self.epochTime())
        return lastName 

def main():
    # Creates an object of dataGen class
    t = dataGen()
    print(t.firstName(), t.lastName())

if __name__ == '__main__':
    main()