[issue18457] Fix and cleanup the ss1.py demo

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

Here is a patch which fixes some bugs in Tools/demo/ss1.py:

* Saving formulas containing & and < symbols.
* Saving complex numbers.

Also it a little cleanups the code:

* Using xml.sax.saxutils.escape instead of html.escape.
* Using the with statement for file I/O.
* Removed out-of-dated and redundant code.

On Python 2 the ss1.py demo is totally broken due to using out-of-dated rexec module.

----------
assignee: serhiy.storchaka
components: Demos and Tools
files: demo_ss1.patch
keywords: patch
messages: 193089
nosy: serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Fix and cleanup the ss1.py demo
type: behavior
versions: Python 3.3, Python 3.4
Added file: http://bugs.python.org/file30925/demo_ss1.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18457>
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