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POCan't iterate over a list class in Python
 

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  1. POCan't iterate over a list class in Python
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    <p>I'm trying to write a simple GUI front end for Plurk using pyplurk.</p> <p>I have successfully got it to create the API connection, log in, and retrieve and display a list of friends. Now I'm trying to retrieve and display a list of Plurks. </p> <p>pyplurk provides a GetNewPlurks function as follows:</p> <pre><code> def GetNewPlurks(self, since): '''Get new plurks since the specified time. Args: since: [datetime.datetime] the timestamp criterion. Returns: A PlurkPostList object or None. ''' offset = jsonizer.conv_datetime(since) status_code, result = self._CallAPI('/Polling/getPlurks', offset=offset) return None if status_code != 200 else \ PlurkPostList(result['plurks'], result['plurk_users'].values()) </code></pre> <p>As you can see this returns a PlurkPostList, which in turn is defined as follows:</p> <pre><code>class PlurkPostList: '''A list of plurks and the set of users that posted them.''' def __init__(self, plurk_json_list, user_json_list=[]): self._plurks = [PlurkPost(p) for p in plurk_json_list] self._users = [PlurkUser(u) for u in user_json_list] def __iter__(self): return self._plurks def GetUsers(self): return self._users def __eq__(self, other): if other.__class__ != PlurkPostList: return False if self._plurks != other._plurks: return False if self._users != other._users: return False return True </code></pre> <p>Now I expected to be able to do something like this:</p> <pre><code>api = plurk_api_urllib2.PlurkAPI(open('api.key').read().strip(), debug_level=1) plurkproxy = PlurkProxy(api, json.loads) user = plurkproxy.Login('my_user', 'my_pass') ps = plurkproxy.GetNewPlurks(datetime.datetime(2009, 12, 12, 0, 0, 0)) print ps for p in ps: print str(p) </code></pre> <p>When I run this, what I actually get is:</p> <pre><code>&lt;plurk.PlurkPostList instance at 0x01E8D738&gt; </code></pre> <p>from the "print ps", then:</p> <pre><code> for p in ps: TypeError: __iter__ returned non-iterator of type 'list' </code></pre> <p>I don't understand - surely a list <em>is</em> iterable? Where am I going wrong - how do I access the Plurks in the PlurkPostList?</p>
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    1. COUnrelated to the problem you are having, I always inherit `object` rather than nothing (i.e., `class PlurkPostList(object):`) so that I am using *new-style classes*.
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      1. USMike Graham
    2. CO...and if you make `PlurkPostList` inherit from standard `list` you've got much less work to do.
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      1. USbobince
    3. CO@bobince, Not really. Inheriting list doesn't get you anything worth while.
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      1. USMike Graham
 

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