>>> B = 3 * [ [ None, None ]] That makes a list of the exact same list object: [ a, a, a ] where a = [ None, None ]. Instead I would do something like (untested python2.x): B = [ [ None, None ] for x in xrange(3) ]
Ramit Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology 712 Main Street | Houston, TX 77002 work phone: 713 - 216 - 5423 This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- http://mail.python.org/mailman/listinfo/python-list
