[issue10461] Use with statement throughout the docs

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

I'm trying to port the example in tutorial/stdlib2.rst, but the sample in "working with binary data record layouts" fails (before my porting to 'with'...)

  struct.error: unpack requires a bytes argument of length 16

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<http://bugs.python.org/issue10461>
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