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POUnserialize 'nested' arrays in Python
 

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    <p>I've been trying to unserialize an array coming into my python script. I have found some extensions to Python (like Scott Hurring's version: <a href="http://hurring.com/scott/code/python/serialize/" rel="nofollow">http://hurring.com/scott/code/python/serialize/</a>) that unserialize simple data structures like:</p> <pre><code>a:2:{s:7:"version";s:3:"457";s:12:"version_beta";s:3:"461";}; </code></pre> <p>My data looks like this (couple of nested arrays):</p> <pre><code>5:a:{i:17;s:2:"36";i:26;a:1:{i:0;s:2:"44";}i:18;s:0:"";i:24;s:0:"";i:19;a:1:{i:0;s:2:"40";}}s:3:"qty";s:1:"1";}s:7:"options";a:3:{i:0;a:7:{s:5:"label";s:13:"Build options";s:5:"value";s:35:"Place headset, leave fork untouched";s:11:"print_value";s:35:"Place headset, leave fork untouched";s:9:"option_id";s:2:"17";s:11:"option_type";s:5:"radio";s:12:"option_value";s:2:"36";s:11:"custom_view";b:0;}i:1;a:7:{s:5:"label";s:22:"Front derailleur mount";s:5:"value";s:33:"Frame with front derailleur mount";s:11:"print_value";s:33:"Frame with front derailleur mount";s:9:"option_id";s:2:"26";s:11:"option_type";s:8:"checkbox";s:12:"option_value";s:2:"44";s:11:"custom_view";b:0;}i:2;a:7:{s:5:"label";s:18:"Pre-order discount";s:5:"value";s:22:"10% pre-order discount";s:11:"print_value";s:22:"10% pre-order discount";s:9:"option_id";s:2:"19";s:11:"option_type";s:8:"checkbox";s:12:"option_value";s:2:"40";s:11:"custom_view";b:0;}}s:14:"bundle_options";a:2:{i:24;a:3:{s:9:"option_id";s:2:"24";s:5:"label";s:6:"Tiller";s:5:"value";a:1:{i:0;a:3:{s:5:"title";s:11:"Tiller 90";s:3:"qty";i:1;s:5:"price";d:0;}}}i:22;a:3:{s:9:"option_id";s:2:"22";s:5:"label";s:22:"Seat size and material";s:5:"value";a:1:{i:0;a:3:{s:5:"title";s:12:"Seat (large)";s:3:"qty";i:1;s:5:"price";d:0;}}}}s:20:"product_calculations";i:1;s:13:"shipment_type";s:1:"0";} </code></pre> <p>In PHP I can simply unserialize this and get a couple of nested array's:</p> <pre><code> Array ( [info_buyRequest] =&gt; Array ( [uenc] =&gt; aHR0cDovL3d3dy5yYXB0b2Jpa2UubmwvYmlrZXMvbWlkLXJhY2VyL21kaS1yYWNlci1mcmFtZS1raXQuaHRtbD9fX19TSUQ9VSZvcHRpb25zPWNhcnQ, [product] =&gt; 171 [related_product] =&gt; [bundle_option] =&gt; Array ( [22] =&gt; 69 [24] =&gt; 74 ) [options] =&gt; Array ( [17] =&gt; 36 [26] =&gt; Array ( [0] =&gt; 44 ) [18] =&gt; [24] =&gt; [19] =&gt; Array ( [0] =&gt; 40 ) ) [qty] =&gt; 1 ) [options] =&gt; Array ( [0] =&gt; Array ( [label] =&gt; Build options [value] =&gt; Place headset, leave fork untouched [print_value] =&gt; Place headset, leave fork untouched [option_id] =&gt; 17 [option_type] =&gt; radio [option_value] =&gt; 36 [custom_view] =&gt; ) [1] =&gt; Array ( [label] =&gt; Front derailleur mount [value] =&gt; Frame with front derailleur mount [print_value] =&gt; Frame with front derailleur mount [option_id] =&gt; 26 [option_type] =&gt; checkbox [option_value] =&gt; 44 [custom_view] =&gt; ) [2] =&gt; Array ( [label] =&gt; Pre-order discount [value] =&gt; 10% pre-order discount [print_value] =&gt; 10% pre-order discount [option_id] =&gt; 19 [option_type] =&gt; checkbox [option_value] =&gt; 40 [custom_view] =&gt; ) ) [bundle_options] =&gt; Array ( [24] =&gt; Array ( [option_id] =&gt; 24 [label] =&gt; Tiller [value] =&gt; Array ( [0] =&gt; Array ( [title] =&gt; Tiller 90° [qty] =&gt; 1 [price] =&gt; 0 ) ) ) [22] =&gt; Array ( [option_id] =&gt; 22 [label] =&gt; Seat size and material [value] =&gt; Array ( [0] =&gt; Array ( [title] =&gt; Seat (large) [qty] =&gt; 1 [price] =&gt; 0 ) ) ) ) [product_calculations] =&gt; 1 [shipment_type] =&gt; 0 ) </code></pre> <p>However I can't figure out how to get this or a similar structure in Python?</p> <p>Thanks for the help in suggesting json and pickle. I had tried these and get strange errors. </p> <p>If I use this little script:</p> <pre><code>import pickle import json data = 'a:2:{s:7:"version";s:3:"457";s:12:"version_beta";s:3:"461";};' my_array = json.loads(data) print my_array </code></pre> <p>Then I get:</p> <pre><code>File "unser.py", line 8, in &lt;module&gt; my_array = json.loads(data) File "/usr/lib/python2.6/json/__init__.py", line 307, in loads return _default_decoder.decode(s) File "/usr/lib/python2.6/json/decoder.py", line 319, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/usr/lib/python2.6/json/decoder.py", line 338, in raw_decode raise ValueError("No JSON object could be decoded") ValueError: No JSON object could be decoded </code></pre> <p>If I swap <code>json.loads</code> for <code>pickle.loads</code> I get:</p> <pre><code>Traceback (most recent call last): File "unser.py", line 8, in &lt;module&gt; my_array = pickle.loads(data) File "/usr/lib/python2.6/pickle.py", line 1374, in loads return Unpickler(file).load() File "/usr/lib/python2.6/pickle.py", line 858, in load dispatch[key](self) File "/usr/lib/python2.6/pickle.py", line 1180, in load_append value = stack.pop() IndexError: pop from empty list </code></pre> <p>I'm obviously missing something silly here...</p>
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    1. COYou could also use JSON to serialize/unserialize here: `json.dumps` and `json.load`: http://docs.python.org/library/json.html (if you can make your source emit JSON)
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