Emile, I modified the code to this: for line in xml: ID = line.split()[1] rslt = "%s,%s"% (line,PIDS[ID]) print rslt
and ended up with this error: Traceback (most recent call last): File "/Users/ara/Desktop/biopy_programs/merge2.py", line 16, in <module> rslt = "%s,%s"% (line,PIDS[ID]) KeyError: 'sp.' Ara -- Quis hic locus, quae regio, quae mundi plaga. Ubi sum. Sub ortu solis an sub cardine glacialis ursae.
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