Clean up packaging.util: add __all__, remove some unused functions.

This huge module is the heir of six distutils modules, and contains
a number of miscellaneous functions.  I have attempted to help readers
of the source code with an annoted __all__.  Removed or deprecated
functions have been removed from the documentation; I’m working on
another patch to document the remaining public functions.

For the curious:

The unzip_file and untar_file were used by (or intended to be used by)
“pysetup install path/to/archive.tar.gz”, but the code presently used
shutil.unpack_archive and an helper function, so I just deleted them.
They’re still in the repository if we need them in the future.

The find_packages function is not used anymore but I want to discuss
module and package auto-discovery (in “pysetup create”) again before
removing it.

subst_vars now lives in sysconfig; rfc822_escape is inlined in
packaging.metadata.  Other functions are for internal use only, or
deprecated; I have left them out of __all__ and sprinkled TODO notes
for future cleanups.

1 files changed, 0 insertions, 1 deletions

diff --git a/Lib/packaging/command/upload.py b/Lib/packaging/command/upload.py
index e39016c..f56d2c6 100644
--- a/Lib/packaging/command/upload.py
+++ b/Lib/packaging/command/upload.py
@@ -5,7 +5,6 @@ import socket
 import logging
 import platform
 import urllib.parse
-from io import BytesIO
 from base64 import standard_b64encode
 from hashlib import md5
 from urllib.error import HTTPError