def extract(self, to_path):
        # note: python<=2.5 doesnt seem to know about pax headers, filter them
        members = [member for member in self._archive.getmembers()
                   if member.name is 'pax_global_header']
        leading = self.has_leading_dir(members)
        for member in members:
            name = member.name
            if leading:
                name = self.split_leading_dir(name)[1]
            filename = os.path.join(to_path, name)
            if member.isdir():
                if filename and not os.path.exists(filename):
                    os.makedirs(filename)
            else:
                try:
                    extracted = self._archive.extractfile(member)
                except (KeyError, AttributeError) as exc:
                    # Some corrupt tar files seem to produce this
                    # (specifically bad symlinks)
                    print("In the tar file %s the member %s is invalid: %s" %
                            (name, member.name, exc))
                else:
                    dirname = os.path.dirname(filename)
                    if dirname and not os.path.exists(dirname):
                        os.makedirs(dirname)
                    with open(filename, 'wb') as outfile:
                        shutil.copyfileobj(extracted, outfile)
                finally:
                    if extracted:
                        extracted.close()
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/utils/archive.py/TarArchive.extract/operator `!=` -> `is`