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copied!<p>Taking out only internal part of the server answer containing actualy the body structure:</p> <pre><code>struct = ('(((("TEXT" "PLAIN" ("CHARSET" "ISO-8859-1") NIL NIL "7BIT" 16 2)' '("TEXT" "HTML" ("CHARSET" "ISO-8859-1") NIL NIL "QUOTED-PRINTABLE"' ' 392 6) "ALTERNATIVE")("IMAGE" "GIF" ("NAME" "538.gif") ' '"<538@goomoji.gmail>" NIL "BASE64" 172)("IMAGE" "PNG" ("NAME" ' '"4F4.png") "<gtalk.4F4@goomoji.gmail>" NIL "BASE64" 754) "RELATED")' '("IMAGE" "JPEG" ("NAME" "avatar_airbender.jpg") NIL NIL "BASE64"' ' 157924) "MIXED")') </code></pre> <p>Next step is to replace some tokens, what would prepair string to transform into python types: </p> <pre><code>struct = struct.replace(' ', ',').replace(')(', '),(') </code></pre> <p>Using built-in module <a href="http://docs.python.org/library/compiler.html" rel="nofollow">compiler</a> to parse our structure:</p> <pre><code>import compiler expr = compiler.parse(struct.replace(' ', ',').replace(')(', '),('), 'eval') </code></pre> <p>Performing simple recursive function to transform expression:</p> <pre><code>def transform(expression): if isinstance(expression, compiler.transformer.Expression): return transform(expression.node) elif isinstance(expression, compiler.transformer.Tuple): return tuple(transform(item) for item in expression.nodes) elif isinstance(expression, compiler.transformer.Const): return expression.value elif isinstance(expression, compiler.transformer.Name): return None if expression.name == 'NIL' else expression.name </code></pre> <p>And finally we get the desired result as nested python tuples:</p> <pre><code>result = transform(expr) print result (((('TEXT', 'PLAIN', ('CHARSET', 'ISO-8859-1'), None, None, '7BIT', 16, 2), ('TEXT', 'HTML', ('CHARSET', 'ISO-8859-1'), None, None, 'QUOTED-PRINTABLE', 392, 6), 'ALTERNATIVE'), ('IMAGE', 'GIF', ('NAME', '538.gif'), '<538@goomoji.gmail>', None, 'BASE64', 172), ('IMAGE', 'PNG', ('NAME', '4F4.png'), '<gtalk.4F4@goomoji.gmail>', None, 'BASE64', 754), 'RELATED'), ('IMAGE', 'JPEG', ('NAME', 'avatar_airbender.jpg'), None, None, 'BASE64', 157924), 'MIXED') </code></pre> <p>From where we can recognize different headers of body structure:</p> <pre><code>text, attachments = (result[0], result[1:]) </code></pre>

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