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from contextlib import contextmanager
from io import StringIO
import sys
def bug(issue=None):
message = "A known bug."
if issue is not None:
message += " See issue #{issue}.".format(issue=issue)
return message
@contextmanager
def captured_output():
new_out, new_err = StringIO(), StringIO()
old_out, old_err = sys.stdout, sys.stderr
try:
sys.stdout, sys.stderr = new_out, new_err
yield sys.stdout, sys.stderr
finally:
sys.stdout, sys.stderr = old_out, old_err
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