246     def map(self, func, iterable, chunksize=None):  argument
251         return self.map_async(func, iterable, chunksize).get()
253     def imap(self, func, iterable, chunksize=1):  argument
261                          for i, x in enumerate(iterable)), result._set_length))
265             task_batches = Pool._get_tasks(func, iterable, chunksize)
271     def imap_unordered(self, func, iterable, chunksize=1):  argument
279                          for i, x in enumerate(iterable)), result._set_length))
283             task_batches = Pool._get_tasks(func, iterable, chunksize)
298     def map_async(self, func, iterable, chunksize=None, callback=None):  argument
303         if not hasattr(iterable, '__len__'):
304             iterable = list(iterable)
307             chunksize, extra = divmod(len(iterable), len(self._pool) * 4)
310         if len(iterable) == 0:
313         task_batches = Pool._get_tasks(func, iterable, chunksize)
314         result = MapResult(self._cache, chunksize, len(iterable), callback)