import unittest
from test.support import threading_helper

threading_helper.requires_working_threading(module=True)


class ItertoolsThreading(unittest.TestCase):

    @threading_helper.reap_threads
    def test_maketrans(self):
        number_of_iterations = 10
        number_of_attempts=100
        for _ in range(number_of_iterations):
            print(f'iteration {_}')
            d = {2000: 'a'}
            def work_iterator(dct):
                for idx in range(number_of_attempts):
                    str.maketrans(dct)
                    idx = 2000 + idx # outside range of small ints
                    dct[idx] = chr(idx%16)
                    dct.pop(idx, None)
            threading_helper.run_concurrently(work_iterator, nthreads=10, args=[d])

if __name__ == "__main__":
    unittest.main()
    print('done')