R. David Murray added the comment: This requires (1) a doc update to indicate the problem and (2) a way to tell fileinput to *not* use readlines to optimize by calling readlines(bufsize), since in the case of using codecs it can be a problem. Presumably buffer=None would be the logical way to spell this. I'm marking this as a doc bug, a separate issue should be opened for adding the fileinput buffer=None enhancement. (The codec module's comments indicate there's no practical way to implement sizehint.) ---------- assignee: -> docs@python components: +Documentation nosy: +docs@python, r.david.murray versions: +Python 3.3, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue20501> _______________________________________