Nick Coghlan added the comment:
The specific error in question here is the one where Python 3 reads the old
Python 2 stream redirection syntax as a combination of the right shift operator
and tuple creation:
```
>>> print >> sys.stderr, "message"
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for >>: 'builtin_function_or_method' and
'_io.TextIOWrapper'
```
Searching for that error message indicates that people are hitting it
reasonably frequently, so we may be able to save them a trip to Google by
adding a custom 'Did you mean "print(<output>, file={:100!r})'.format(rhs)"?
message when the right-shift operand dispatch is about to report the default
"no implementation" type error, and the LHS is the print builtin.
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<http://bugs.python.org/issue30721>
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