Remove unused import and reorganize imports of modules.

command/sdist.py

@@ -8,7 +8,9 @@ from glob import glob
 from warnings import warn
 
 from distutils.core import Command
-from distutils import dir_util, dep_util, file_util, archive_util
+from distutils import dir_util
+from distutils import file_util
+from distutils import archive_util
 from distutils.text_file import TextFile
 from distutils.filelist import FileList
 from distutils import log