Added split script example. [skip-ci]

examples/uploading/split.py

+# Simple script that distributes the contents of a tar file over even sized 32GB zip file.
+# It will not split directories to preserve the mainfile/auxiliary file structure.
+
+import tarfile
+import os.path
+import zipfile
+
+file = './file-to-split.tar.gz'
+name = 'zip-file-name'
+
+tar_file = tarfile.open(file, 'r:gz')
+
+size_per_zip = 32 * 1024 * 1024 * 1024
+
+current_zip = None
+current_zip_number = 0
+current_dir = None
+current_size = 0
+
+while True:
+    info = tar_file.next()
+
+    if not info.isfile():
+        continue
+
+    this_dir = os.path.dirname(info.name)
+    current_size += info.size
+
+    if current_size > size_per_zip and this_dir != current_dir:
+        # split
+        current_zip.close()
+        current_zip = None
+        current_zip_number += 1
+        current_size = info.size
+
+    if current_zip is None:
+        zip_file_name = f'{name}-{current_zip_number}.zip'
+        current_zip = zipfile.ZipFile(zip_file_name, mode='w', compression=0, allowZip64=True)
+
+    reader = tar_file.extractfile(info)
+    with current_zip.open(info.name, mode='w') as f:
+        f.write(reader.read())
+
+    current_dir = this_dir
+
+tar_file.close()