google app engine ndb, filter after query: 'list' object has no attribute 'filter' -

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निम्न कथन एक त्रुटि संदेश उत्पन्न करता है AttributeError: 'list' ऑब्जेक्ट में कोई विशेषता 'फिल्टर' नहीं है । मैंने सोचा कि फ़िल्टर के बाद क्वेरी बिल्कुल ठीक है। तब आखिर समस्या क्या थी? अग्रिम धन्यवाद। 

  खरीद = खरीद.कुड़ी (खरीदडेटा & gt; startDate, purchase.date & lt; endDate) ... खरीदारियां = खरीद .फिल्टर (खरीद.कायम == member.account , एनडीबी.ओआर (खरीद कंसोमोडमोड == 'बिडिंग', खरीद कंसोमोडमोड == 'क्रयिंग'))। Fetch ()    
 
 
 यदि खरीद एक क्वेरी है, तो फ़िल्टर ठीक काम करता है।  
 यदि कोई क्वेरी क्वेरी के परिणामों को प्राप्त करने के बाद एक सूची है, तो यह काम नहीं करेगा, जैसे < / P> 
  खरीद = [आइटम में खरीदारी के लिए आइटम]   
 आपके कोड में क्या होता है?

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