Python：没有参数的函数，每次调用时都会返回一个不同且唯一的数字

Question

I want to make a function that dispenses a new number (in this case the next whole number) every time it is called without any use of parameters in said function. Is this possible?

ie the output on the first call would be 1, the next time 2 and so on.

Answer 1

You can take a look at itertools.count which does what you're looking for.

If you want to implement it yourself, you can use the code in the code block below the words Equivalent to: as your starting point and setting your custom start number and remove the parameters from the function.

Answer 2

You could achieve calling without () thought a property:

class F(object):
    def __init__(self, v=0):
        self.v = v
    @property
    def next(self):
        self.v += 1
        return self.v

 >>> f = F()
 >>> f.next, f.next, f.next
 (1, 2, 3)