setuptools はひでえコードだった

#import distutils.log; distutils.log.set_verbosity(2)
from setuptools.package_index import PackageIndex
class PackageIndex(PackageIndex):
def can_add(self, dist):
"""deny local installed packages"""
if os.path.exists(dist.location):
return False
return super(PackageIndex, self).can_add(dist)
package_name = 'chardet'
tmpdir = tempfile.mkdtemp(prefix='python-')
filename = PackageIndex().download(package_name, tmpdir)