248     def map(self, func, iterable, chunksize=None):  argument
253         return self.map_async(func, iterable, chunksize).get()
255     def imap(self, func, iterable, chunksize=1):  argument
260         if chunksize == 1:
266             assert chunksize > 1
267             task_batches = Pool._get_tasks(func, iterable, chunksize)
273     def imap_unordered(self, func, iterable, chunksize=1):  argument
278         if chunksize == 1:
284             assert chunksize > 1
285             task_batches = Pool._get_tasks(func, iterable, chunksize)
300     def map_async(self, func, iterable, chunksize=None, callback=None):  argument
308         if chunksize is None:
309             chunksize, extra = divmod(len(iterable), len(self._pool) * 4)
311                 chunksize += 1
313             chunksize = 0
315         task_batches = Pool._get_tasks(func, iterable, chunksize)
316         result = MapResult(self._cache, chunksize, len(iterable), callback)
594     def __init__(self, cache, chunksize, length, callback):  argument
598         self._chunksize = chunksize
599         if chunksize <= 0:
604             self._number_left = length//chunksize + bool(length % chunksize)