Question

Given a class that has an attribute self.id I need to populate that attribute with a counter starting at 0 and all objects of that class need a unique id during a single run of the program. What is the best/ most pythonic way of doing this? Currently I use

def _get_id():
    id_ = 0
    while True:
       yield id_
       id_ += 1
get_id = _get_id()

which is defined outside the class and

self.id = get_id.next()

in the class’ __init__(). Is there a better way to do this? Can the generator be included in the class?

Answer 1

Use itertools.count:

from itertools import count

class MyClass(object):
    id_counter = count().next
    def __init__(self):
        self.id = self.id_counter()