Nick Coghlan added the comment:
We actually use a variant of this idea in the test suite
(http://docs.python.org/dev/library/test#test.support.captured_stdout)
It would be pretty easy to combine the two concepts by defaulting the
redirection to a new StringIO instance if no other destination is given:
print('This goes to stdout')
with redirect_stdout(sys.stderr):
print('This goes to stderr')
print('So does this')
print('This goes to stdout')
with redirect_stdout() as s:
print('This goes to the io.StringIO instance "s"')
print('So does this')
print('This goes to stdout')
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<http://bugs.python.org/issue15805>
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