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POPython: How to extract variable name of a dictionary entry?
 

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  1. POPython: How to extract variable name of a dictionary entry?
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    <p>I'm wondering how I would go about finding the variable name of a dictionary element:</p> <p>For example:</p> <pre><code> &gt;&gt;&gt;dict1={} &gt;&gt;&gt;dict2={} &gt;&gt;&gt;dict1['0001']='0002' &gt;&gt;&gt;dict2['nth_dict_item']=dict1 &gt;&gt;&gt;print dict2 {'nth_dict_item': {'0001': '0002'}} &gt;&gt;&gt;print dict2['nth_dict_item'] {'001': '002'} </code></pre> <p>How can I go about making it tell me that dict2['nth_dict_item'] is or is referencing "dict1" ? I want the name of the data structure it's referencing and not the data itself.</p> <p>If I compare the output of id(dict1) to id(dict2['nth_dict_item']) I can find they are the same.</p> <p>But how can I turn that id back into a variable name? Is there a more direct/cleaner method of getting the information that I want to know?</p> <p>I'm sure I'm just overlooking a function that would make my life easy but I'm pretty new to Python :)</p> <p>Any help is appreciated, thanks!</p> <h3>Related</h3> <ul> <li><a href="https://stackoverflow.com/questions/544919/python-can-i-print-original-var-name">python, can i print original var name?</a></li> <li><a href="https://stackoverflow.com/questions/592746/how-can-you-print-a-variable-name-in-python">How can you print a variable name in python?</a></li> </ul> <hr> <p>Update: Here's why I wanted this to work:</p> <p>I'm trying to make an app that uses a dictionary kinda like a database. I wanted the functionality of this psuedocode to function:</p> <pre><code>dict_1={} dict_2={} dict_3={} dict_1["FooBar1.avi"]=[movie_duration,movie_type,comments] dict_2["FooBar2.avi"]=[movie_duration,movie_type,comments] dict_3["FooBar3.avi"]=[movie_duration,movie_type,comments] dict_database[SomeUniqueIdentifier1]=dict_1 dict_database[SomeUniqueIdentifier2]=dict_2 dict_database[SomeUniqueIdentifier3]=dict_3 </code></pre> <p>SomeUniqueIdentifier# would be a unique value that I'm using as a database key/unqiueID to look up entries.</p> <p>I want to be able to update the "comments" field of FooBar1.avi by:</p> <pre><code>WhichDict= dict_database[SomeUniqueIdentifier1] WhichDict[WhichDict.keys()[0]][2]='newcomment' </code></pre> <p>instead of having to do:</p> <pre><code>dict_database['SomeUniqueIdentifier1'][dict_database['SomeUniqueIdentifier1'].keys()[0]][2]='newcomment' </code></pre> <hr> <p>Thanks everyone. I now understand I was misunderstanding a LOT of basics (total brain fart). Will go back and fix the design. Thanks to you all!.</p>
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    1. COdupe - http://stackoverflow.com/questions/544919/python-can-i-print-original-var-name
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    2. COwhat are dict_1, dict_2, and dict_3? And is the second "FooBar2.avi" supposed to be "FooBar3.avi"?
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    3. COWait, so you're create a new dictionary for each movie, with a single entry, where the key is the name of the movie and the value is an array of movie properties? Is my understanding correct?
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