> >>> foo = foo + ['c'] # Add 'c' back to foo. > >>> foo > ['a', 'b', 'c'] # 'c' is back. Good. > >>> bar > ['a', 'b'] # ??? What the... ??? Where is 'c'? If you want to find out this one yourself, use >>> id (foo), id (bar), id (baz) at various places Daniel -- Daniel Dittmar daniel.dittmar at sap.com SAP DB, SAP Labs Berlin http://www.sapdb.org/