import urlparse
path = urlparse.urlparse('/path/to/file?_subject_ID_SOMEOTHERSTRING').path
import os.path
print(os.path.split(path)[1]) # => file
print(os.path.split(path)[0]) # => /path/to
aW1wb3J0IHVybHBhcnNlCnBhdGggPSB1cmxwYXJzZS51cmxwYXJzZSgnL3BhdGgvdG8vZmlsZT9fc3ViamVjdF9JRF9TT01FT1RIRVJTVFJJTkcnKS5wYXRoCmltcG9ydCBvcy5wYXRoCnByaW50KG9zLnBhdGguc3BsaXQocGF0aClbMV0pICMgPT4gZmlsZQpwcmludChvcy5wYXRoLnNwbGl0KHBhdGgpWzBdKSAjID0+IC9wYXRoL3Rv