[Python] How can I make the get_random_string Django module to return only numerical values?

What should I do to my simple code below, so that it only returns numerical values?

>>> from django.utils.crypto import get_random_string
>>> get_random_string(10)
>>> 'PhaWT9X02U'


Something like: 1067603657 And if it is possible, can you recommend an id field generated in this manner?

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