[issue19100] Use backslashreplace in pprint

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In new patch wrapping stream is moved to PrettyPrinter constructor.

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Added file: http://bugs.python.org/file33084/pprint_unencodable_2.patch

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<http://bugs.python.org/issue19100>
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