PY3: Cannot encrypt from a file about python-gnupg HOT 4 CLOSED

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AttributeError                            Traceback (most recent call last)
<ipython-input-6-92da3f610976> in <module>()
----> 1 r = gpg.encrypt(f, None, **kwargs)

/home/isis/code/riseup/python-gnupg/gnupg/gnupg.py in encrypt(self, data, *recipients, **kwargs)
    970             stream = data
    971         else:
--> 972             stream = _make_binary_stream(data, self._encoding)
    973         result = self._encrypt(stream, recipients, **kwargs)
    974         stream.close()

/home/isis/code/riseup/python-gnupg/gnupg/_util.py in _make_binary_stream(s, encoding)
    466         else:
    467             if type(s) is not str:
--> 468                 s = s.encode(encoding)
    469         from io import BytesIO
    470         rv = BytesIO(s)

AttributeError: 'file' object has no attribute 'encode'