How to cut itertools.product process in python?

Question

I want to process a very large object itertools.product. The problem is this:

import string
from itertools import product
text = string.lowercase[:] + string.uppercase[:] + '0123456789'
items = product(text, repeat=5)
for item in items:
    #do something

I know the length items 62**5. If I want to process elements itemswhose indices range from 300000to 600000, how do I do this?

I tried converting the list itertools.productto a python list, for example:

items = list(product(text, repeat=5))[300000:600000+1]
for item in items:
    #do something

but, it seems, the conversion has consumed a large amount of memory, since I have been waiting for this conversion for a long time and finally abandoned it.

I have this requirement because I want to do this in python gevent, so I want to cut large itertool.productinto small elements for gevent spawn.

Answer 1

islice, .

from itertools import product, islice
import string 

text = string.ascii_letters + string.digits
for item in islice(product(text,repeat=5), 300000, 600000):
    # do something