On Wed, 04 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED] let this slip: > b={} > a=[] > for line in fl.readlines(): > info=lines.split() > b[info[0]] = a.append(info[1]) append does not return a value. you'll want something like d = {} for line in fl: key, value = line.strip().split() if key not in d: d[key] = [] d[key].append(value)
or something with setdefault, as limodou suggested. > for i in b: > print i,b[i] you can also use: for k,v in d.iteritems(): print k,v if you're dealing with integers only, you'll want to convert the data when reading using int() and long(). > i get > 2 None > 7 None > > data file is: > 2 1 > 2 2 > 2 3 > 2 4 > 7 7 > 7 8 > 7 9 > 7 10 -- Thomas Jollans alias free-zombie -- http://mail.python.org/mailman/listinfo/python-list