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This morning, I was running an install of a package on Python 3.4.1 when I encountered this error:
C:\Users\jaraco\projects\jaraco.financial [default tip]> ./setup install
running install
running bdist_egg
running egg_info
writing namespace_packages to jaraco.financial.egg-info\namespace_packages.txt
writing jaraco.financial.egg-info\PKG-INFO
writing top-level names to jaraco.financial.egg-info\top_level.txt
writing requirements to jaraco.financial.egg-info\requires.txt
writing dependency_links to jaraco.financial.egg-info\dependency_links.txt
writing entry points to jaraco.financial.egg-info\entry_points.txt
writing manifest file 'jaraco.financial.egg-info\SOURCES.txt'
installing library code to build\bdist.win-amd64\egg
running install_lib
running build_py
copying jaraco\financial\records.py -> build\lib\jaraco\financial
creating build\bdist.win-amd64\egg
creating build\bdist.win-amd64\egg\jaraco
creating build\bdist.win-amd64\egg\jaraco\financial
copying build\lib\jaraco\financial\ledger.py -> build\bdist.win-amd64\egg\jaraco\financial
copying build\lib\jaraco\financial\qif.py -> build\bdist.win-amd64\egg\jaraco\financial
copying build\lib\jaraco\financial\merchant.py -> build\bdist.win-amd64\egg\jaraco\financial
Traceback (most recent call last):
 File "C:\Program Files\Python34\lib\distutils\dir_util.py", line 126, in copy_tree
 names = os.listdir(src)
OSError: [WinError 59] An unexpected network error occurred: 'build\\lib\\jaraco\\financial\\records.py'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "C:\Users\jaraco\projects\jaraco.financial\setup.py", line 72, in <module>
 setuptools.setup(**setup_params)
 File "C:\Program Files\Python34\lib\distutils\core.py", line 148, in setup
 dist.run_commands()
 File "C:\Program Files\Python34\lib\distutils\dist.py", line 955, in run_commands
 self.run_command(cmd)
 File "C:\Program Files\Python34\lib\distutils\dist.py", line 974, in run_command
 cmd_obj.run()
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\install.py", line 67, in run
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\install.py", line 109, in do_egg_install
 File "C:\Program Files\Python34\lib\distutils\cmd.py", line 313, in run_command
 self.distribution.run_command(command)
 File "C:\Program Files\Python34\lib\distutils\dist.py", line 974, in run_command
 cmd_obj.run()
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\bdist_egg.py", line 161, in run
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\bdist_egg.py", line 147, in call_command
 File "C:\Program Files\Python34\lib\distutils\cmd.py", line 313, in run_command
 self.distribution.run_command(command)
 File "C:\Program Files\Python34\lib\distutils\dist.py", line 974, in run_command
 cmd_obj.run()
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\install_lib.py", line 10, in run
 File "C:\Program Files\Python34\lib\distutils\command\install_lib.py", line 111, in install
 outfiles = self.copy_tree(self.build_dir, self.install_dir)
 File "C:\Program Files\Python34\lib\site-packages\setuptools-5.7-py3.4.egg\setuptools\command\install_lib.py", line 38, in copy_tree
 File "C:\Program Files\Python34\lib\distutils\cmd.py", line 357, in copy_tree
 not self.force, dry_run=self.dry_run)
 File "C:\Program Files\Python34\lib\distutils\dir_util.py", line 160, in copy_tree
 verbose=verbose, dry_run=dry_run))
 File "C:\Program Files\Python34\lib\distutils\dir_util.py", line 160, in copy_tree
 verbose=verbose, dry_run=dry_run))
 File "C:\Program Files\Python34\lib\distutils\dir_util.py", line 160, in copy_tree
 verbose=verbose, dry_run=dry_run))
 File "C:\Program Files\Python34\lib\distutils\dir_util.py", line 128, in copy_tree
 (errno, errstr) = e
TypeError: 'OSError' object is not iterable
The original traceback indicates a network error occurred. The secondary error occurs when the error is assumed to be an iterable of two elements. I suspect this issue arises from the conversion of WindowsError to OSError or similar.
I plan to look at this in more depth later.