Update dcase2018-task3.py

dcase2018-task3.py

@@ -232,21 +232,24 @@ def download_file(
     if unpack:
         if dest_unpack is None:
             dest_unpack = os.path.dirname(dest)
-        logger.info(f"Extracting {dest} to {dest_unpack}")
-        # shutil unpack_archive does not work with tar.gz files
-        if (
-            source.endswith(".tar.gz")
-            or source.endswith(".tgz")
-            or source.endswith(".gz")
-        ):
-            out = dest.replace(".gz", "")
-            with gzip.open(dest, "rb") as f_in:
-                with open(out, "wb") as f_out:
-                    shutil.copyfileobj(f_in, f_out)
+        if os.path.exists(dest_unpack):
+            logger.info(f"{dest_unpack} already exists. Skipping extraction")
         else:
-            shutil.unpack_archive(dest, dest_unpack)
-        if write_permissions:
-            set_writing_permissions(dest_unpack)
+            logger.info(f"Extracting {dest} to {dest_unpack}")
+            # shutil unpack_archive does not work with tar.gz files
+            if (
+                source.endswith(".tar.gz")
+                or source.endswith(".tgz")
+                or source.endswith(".gz")
+            ):
+                out = dest.replace(".gz", "")
+                with gzip.open(dest, "rb") as f_in:
+                    with open(out, "wb") as f_out:
+                        shutil.copyfileobj(f_in, f_out)
+            else:
+                shutil.unpack_archive(dest, dest_unpack)
+            if write_permissions:
+                set_writing_permissions(dest_unpack)
 
 
 def set_writing_permissions(folder_path):