ó Y_Sc@@spdZddlmZddlmZmZmZddlmZm Z dZ dZ d d „Z d d „Zd S(síRead the sequence data from a nexus file. This IO code only gives read access to the sequence data. Reference: 'NEXUS: An extensible file format for systematic information' Maddison, Swofford, Maddison. 1997. Syst. Biol. 46(4):590-621 i(tabsolute_importi(tSeqtSeqListtAlphabeti(tNexustsafenametnexustpauptnextnxscC@stt||ƒƒS(s'Iterate over the sequences in the file.(titertread(tfintalphabet((sA/home/psgendb/BIRCHDEV/pkg/weblogo-3.4/corebio/seq_io/nexus_io.pytiterseq-scC@s¹t|ƒ}g}xy|jD]n}t|ƒ}|j|}|dkret|d|d|jƒ}nt|d|d|ƒ}|j|ƒqWt|ƒdkr¯t dƒ‚nt |ƒS(s) Extract sequence data from a nexus file.tnameR isCannot parse fileN( Rt taxlabelsRtmatrixtNoneRR tappendtlent ValueErrorR(R R tntseqsttaxonRtrts((sA/home/psgendb/BIRCHDEV/pkg/weblogo-3.4/corebio/seq_io/nexus_io.pyR 3s    N(RR(RRRR (t__doc__t __future__RtseqRRRt_nexusRRtnamest extensionsRRR (((sA/home/psgendb/BIRCHDEV/pkg/weblogo-3.4/corebio/seq_io/nexus_io.pyt#s