[issue17436] pass a file object to hashlib.update

[anatoly techtonik]

anatoly techtonik added the comment:

Even though I mentioned passing file object in the title of this bugreport, what I really need is the following API:

  hexhash = hashlib.sha256().readfile(filename).hexdigest()

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17436>
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