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def zip_write_dir(zip_fileobj, dir_path, files_prefix=''):
    for dirpath, dirnames, dirfiles in os.walk(dir_path):
        for dirname in dirnames:
            if files_prefix:
                dir_prefix = '%s/%s' % (files_prefix, dirname)
            else:
                dir_prefix = dirname
            dir_path = os.path.join(dirpath, dirname)
            zip_write_dir(zip_fileobj, dir_path, files_prefix=dir_prefix)

        for filename in dirfiles:
            file_path = os.path.join(dirpath, filename)
            zip_fileobj.write(file_path, '%s/%s' % (files_prefix, filename))

# USAGE

# -- FOLDER CONTENT
# - file1.py
# - file2.py
# - another_folder/filex.py
#
# zip_write_dir(a_zip_object, '/sample/this/', files_prefix='this')
#
# -- ZIP CONTENT
# - this/file1.py
# - this/file2.py
# - this/another_folder/filex.py