def numsToString(listy): for e in listy: if 'mynum' in e: e['mynum'] = "{:.1f}".format(float(e['mynum'])) return listy first = [{'date': '1947-04-01', 'mynum': 17}, {'date': '1947-07-01', 'mynum': 18}, {'date': '1947-10-01', 'mynum': 21}] second = first print "first list (untouched): %s" % first print "second list: %s" % numsToString(second) print "first list (again): %s" % first # why is this list altered?
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