rename-group: use py3.5 compatible construct
@@ -232,7 +232,7 @@ class Workspace():
url_replacements = {}
log.info("Moving files")
for mets_file in self.mets.find_files(fileGrp=old, local_only=True):
- new_url = sub(rf'^{old}/', f'{new}/', mets_file.url)
+ new_url = sub(r'^%s/' % old, '%s/' % new, mets_file.url)
url_replacements[mets_file.url] = new_url
# move file from ``old`` to ``new``
move(mets_file.url, new_url)
