added istarmap

module1_2/istarmap.py

+# Referenced from https://stackoverflow.com/questions/57354700/starmap-combined-with-tqdm
+
+# istarmap.py for Python 3.8+
+import multiprocessing.pool as mpp
+
+
+def istarmap(self, func, iterable, chunksize=1):
+    """starmap-version of imap
+    """
+    self._check_running()
+    if chunksize < 1:
+        raise ValueError(
+            "Chunksize must be 1+, not {0:n}".format(
+                chunksize))
+
+    task_batches = mpp.Pool._get_tasks(func, iterable, chunksize)
+    result = mpp.IMapIterator(self)
+    self._taskqueue.put(
+        (
+            self._guarded_task_generation(result._job,
+                                          mpp.starmapstar,
+                                          task_batches),
+            result._set_length
+        ))
+    return (item for chunk in result for item in chunk)
+
+
+mpp.Pool.istarmap = istarmap
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