Can't upload tarballs to PyPI - twine update required

[Alberto Donato]

When trying to upload a sdist (tar.gz) package to PyPI from Bionic, I get the following error:

TypeError: expected string or bytes-like object

(see also https://stackoverflow.com/questions/49806586/twine-upload-typeerror-expected-string-or-bytes-like-object)

Uloading a bdist_wheel of the same package works.

The upload worked using the latest twine version (1.11.0).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: twine 1.10.0-1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jun 8 18:27:18 2018
InstallationDate: Installed on 2018-02-25 (102 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180225)
PackageArchitecture: all
SourcePackage: twine
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

This bug was fixed in the package twine - 1.12.1-1

---------------
twine (1.12.1-1) unstable; urgency=medium

  [ Stefano Rivera ]
  * New upstream release (LP: #1775886)
  * New B-D: python3-readme-renderer.
  * Bump debhelper compat level to 11.
  * Bump Standards-Version to 4.2.1, no changes needed.

  [ Ondřej Nový ]
  * d/control: Remove ancient X-Python3-Version field

 -- Stefano Rivera <email address hidden> Sat, 13 Oct 2018 14:42:11 +0200