Error installing PyBabeljs on virtualenv

This is the output:
```
Searching for PyBabeljs
Reading https://pypi.org/simple/PyBabeljs/
Downloading https://files.pythonhosted.org/packages/7b/c1/4e6a32cd9f0fe9afecff430313205af5c21927eb74d992f45cc140d21049/PyBabeljs-0.0.7.tar.gz#sha256=90fdc4cb8dc07dda57c7e53892be05bab3ad240365884b8193f40fde488ea36d
Best match: PyBabeljs 0.0.7
Processing PyBabeljs-0.0.7.tar.gz
Writing /tmp/easy_install-7k6sy7l3/PyBabeljs-0.0.7/setup.cfg
Running PyBabeljs-0.0.7/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7k6sy7l3/PyBabeljs-0.0.7/egg-dist-tmp-qsuwriyl
Warning: 'keywords' should be a list, got type 'tuple'
zip_safe flag not set; analyzing archive contents...
Traceback (most recent call last):
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 154, in save_modules
yield saved
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 250, in run_setup
_execfile(setup_script, ns)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 45, in _execfile
exec(code, globals, locals)
File "/tmp/easy_install-7k6sy7l3/PyBabeljs-0.0.7/setup.py", line 20, in
"description",
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/__init__.py", line 129, in setup
return distutils.core.setup(**attrs)
File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 220, in run
os.path.join(archive_root, 'EGG-INFO'), self.zip_safe()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 273, in zip_safe
return analyze_egg(self.bdist_dir, self.stubs)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 383, in analyze_egg
safe = scan_module(egg_dir, base, name, stubs) and safe
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 422, in scan_module
code = marshal.load(f)
ValueError: bad marshal data (unknown type code)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "setup.py", line 78, in
setup(**setup_data)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/__init__.py", line 129, in setup
return distutils.core.setup(**attrs)
File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/install.py", line 67, in run
self.do_egg_install()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/install.py", line 117, in do_egg_install
cmd.run()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 412, in run
self.easy_install(spec, not self.no_deps)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 654, in easy_install
return self.install_item(None, spec, tmpdir, deps, True)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 701, in install_item
self.process_distribution(spec, dist, deps)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 746, in process_distribution
[requirement], self.local_index, self.easy_install
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/pkg_resources/__init__.py", line 774, in resolve
replace_conflicting=replace_conflicting
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/pkg_resources/__init__.py", line 1057, in best_match
return self.obtain(req, installer)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/pkg_resources/__init__.py", line 1069, in obtain
return installer(requirement)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 673, in easy_install
return self.install_item(spec, dist.location, tmpdir, deps)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 699, in install_item
dists = self.install_eggs(spec, download, tmpdir)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 884, in install_eggs
return self.build_and_install(setup_script, setup_base)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 1152, in build_and_install
self.run_setup(setup_script, setup_base, args)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/easy_install.py", line 1138, in run_setup
run_setup(setup_script, args)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 253, in run_setup
raise
File "/usr/local/lib/python3.7/contextlib.py", line 127, in __exit__
self.gen.throw(type, value, traceback)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/usr/local/lib/python3.7/contextlib.py", line 127, in __exit__
self.gen.throw(type, value, traceback)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 166, in save_modules
saved_exc.resume()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 141, in resume
six.reraise(type, exc, self._tb)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/_vendor/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 154, in save_modules
yield saved
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 250, in run_setup
_execfile(setup_script, ns)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/sandbox.py", line 45, in _execfile
exec(code, globals, locals)
File "/tmp/easy_install-7k6sy7l3/PyBabeljs-0.0.7/setup.py", line 20, in
"description",
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/__init__.py", line 129, in setup
return distutils.core.setup(**attrs)
File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 220, in run
os.path.join(archive_root, 'EGG-INFO'), self.zip_safe()
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 273, in zip_safe
return analyze_egg(self.bdist_dir, self.stubs)
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 383, in analyze_egg
safe = scan_module(egg_dir, base, name, stubs) and safe
File "/home/mondeja/Escritorio/pydocs/my_libraries/siglo25/env/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 422, in scan_module
code = marshal.load(f)
ValueError: bad marshal data (unknown type code)
```

I think that adding `zip_safe=True` it's fixed. Also, changing `keywords` type (from tuple to list), the warning shown `Warning: 'keywords' should be a list, got type 'tuple'` can be avoided.

Start with setup.py around line 20 and the package metadata that produces setup.cfg; reproduce the virtualenv installation failure shown in the report. Check whether the proposed zip_safe and keywords changes remove the bad marshal data error and warning, then confirm that installation succeeds.

Written by the indexing model from the issue text.