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File warning instead of fail if stdout does not have encoding

See original GitHub issue

According to Python manual sys.stdout should have encoding. Unfortunatelly, nose monekypatches it with StringIO with out of encoding.


Its nose fault, not win-unicode-console fault. But can we please do

def check_encodings():
		if sys.stdin.encoding != sys.stdout.encoding:
			# raise RuntimeError("sys.stdin.encoding != sys.stdout.encoding, readline hook doesn't know, which one to use to decode prompt")

			warnings.warn("sys.stdin.encoding == {!r}, whereas sys.stdout.encoding == {!r}, readline hook consumer may assume they are the same".format(sys.stdin.encoding, sys.stdout.encoding),
				RuntimeWarning, stacklevel=3)
	except AttributeError:
		warnings.warn("stdin or stdout does not have encoding")


Issue Analytics

  • State:open
  • Created 6 years ago
  • Reactions:1
  • Comments:5 (2 by maintainers)

github_iconTop GitHub Comments

Drekincommented, Nov 27, 2017

Does the solution of #36 work for you? Also thank you for the pull request, but I’ll probably add something like

no_encoding = object()
stdin_encoding = getattr(sys.stdin, "encoding", no_encoding)
if stdin_encoding is no_encoding: warn()

So, stdin and stdout cases are distinguished. Also, there is probably a reason to use stacklevel=3 in the warn, so I would use it here also.

GadgetStevecommented, Jan 15, 2018

@Drekin A clear warning is always better than a crash.

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