About: http://webisa.webdatacommons.org/277188413

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In Python, everything is an object and objects are passed by reference; hence altering the contents of a in your second example is clearly going to alter the contents of b, since they are references to the same object.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org