#NEWLINE# def create_uniqueness_constraint( self , label , property_key ) : #NEWLINE# #INDENT# ' Create a uniqueness constraint for a label.\n        ' #NEWLINE# self . _uniqueness_constraint_template . expand ( label = label ) . post ( { #NEWLINE# #INDENT# 'property_keys' : [ property_key ] , #NEWLINE# #UNINDENT# } )