Creating an index using python embedded bindings in Neo4j

gistfile1.py

with db.transaction:        
         # Create an index for nodes & relations
         COMPANY_NAME_INDEX = "COMPANY_NAME_INDEX"

if db.node.indexes.exists(COMPANY_NAME_INDEX) == 0:
         companyNameIndex = db.node.indexes.create(COMPANY_NAME_INDEX)
else:       
         companyNameIndex = db.node.indexes.get(COMPANY_NAME_INDEX)