$ python3 --version
Python 3.1.3
$ python3 setup.py bdist upload --sign
[snip]
Traceback (most recent call last):
File "setup.py", line 71, in <module>
cmdclass = dict(build_py=build_py)
File "/usr/local/lib/python3.1/distutils/core.py", line 149, in setup
dist.run_commands()
File "/usr/local/lib/python3.1/distutils/dist.py", line 919, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python3.1/distutils/dist.py", line 938, in run_command
cmd_obj.run()
File "/usr/local/lib/python3.1/distutils/command/upload.py", line 66, in run
self.upload_file(command, pyversion, filename)
File "/usr/local/lib/python3.1/distutils/command/upload.py", line 155, in upload_file
body.write(value)
TypeError: 'str' does not support the buffer interface
Without --sign it works just fine.