Iterating through a JSON object

Question

I am trying to iterate through a JSON object to import data  i e  title and link  I can t seem to get to the content that is past the      JSON                     title    Baby  Feat  Ludacris  - Justin Bieber            description    Baby  Feat  Ludacris  by Justin Bieber on Grooveshark            link    http   listen grooveshark com s Baby Feat Ludacris  2Bqvdq            pubDate    Wed  28 Apr 2010 02 37 53 -0400            pubTime   1272436673           TinyLink    http   tinysong com d3wI            SongID    24447862            SongName    Baby  Feat  Ludacris             ArtistID    1118876            ArtistName    Justin Bieber            AlbumID    4104002            AlbumName    My World  Part II   nhttp   tinysong com gQsw            LongLink    11578982            GroovesharkLink    11578982            Link    http   tinysong com d3wI                        title    Feel Good Inc - Gorillaz            description    Feel Good Inc by Gorillaz on Grooveshark            link    http   listen grooveshark com s Feel Good Inc 1UksmI            pubDate    Wed  28 Apr 2010 02 25 30 -0400            pubTime   1272435930           I tried using a dictionary   def getLastSong user limit       base url    http   gsuser com lastSong       user url   base url   str user          str limit            raw   urllib urlopen user url      json raw  raw readlines       json object   json loads json raw 0         filtering and making it look good      gsongs          print json object     for song in json object 0              print song   This code only prints the information before     ignore the Justin Bieber track

User · Answer

I would solve this problem more like this  import json import urllib2  def last song user  limit         Assembling strings with  foo    str bar     baz        generally isn t        as nice as using real string formatting  It can seem simpler at first         but leaves you less happy in the long run      url    http   gsuser com lastSong  s  d      user  limit         urllib urlopen is deprecated in favour of urllib2 urlopen     site   urllib2 urlopen url         The json module has a function load for loading from file-like objects         like the one you get from  urllib2 urlopen   You don t need to turn        your data into a string and use loads and you definitely don t need to        use readlines or readline  there is seldom if ever reason to use a        file-like object s readline s  methods       songs   json load site         I don t know why  lastSong  stuff returns something like this  but        your json thing was a JSON array of two JSON objects  This will        deserialise as a list of two dicts  with each item representing        each of those two songs              Since each of the songs is represented by a dict  it will iterate        over its keys  like any other Python dict        baby  feel good   songs        Rather than printing in a function  it s usually better to        return the string then let the caller do whatever with it         You said you wanted to make the output pretty but you didn t        mention  how   so here s an example of a prettyish representation       from the song information given      return    SongName s by   ArtistName s - listen at   link s    baby

User · Answer

This question has been out here a long time  but I wanted to contribute how I usually iterate through a JSON object   In the example below  I ve shown a hard-coded string that contains the JSON  but the JSON string could just as easily have come from a web service or a file   import json  def main           create a simple JSON array     jsonString      key1   value1   key2   value2   key3   value3           change the JSON string into a JSON object     jsonObject   json loads jsonString         print the keys and values     for key in jsonObject          value   jsonObject key          print  The key and value are              format key  value        pass  if   name         main         main

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If you can store the json string in a variable jsn string import json  jsn list   json loads json dumps jsn string       for lis in jsn list         for key val in lis items               print key  val   Output   title Baby  Feat  Ludacris  - Justin Bieber description Baby  Feat  Ludacris  by Justin Bieber on Grooveshark link http   listen grooveshark com s Baby Feat Ludacris  2Bqvdq pubDate Wed  28 Apr 2010 02 37 53 -0400 pubTime 1272436673 TinyLink http   tinysong com d3wI SongID 24447862 SongName Baby  Feat  Ludacris  ArtistID 1118876 ArtistName Justin Bieber AlbumID 4104002 AlbumName My World  Part II   http   tinysong com gQsw LongLink 11578982 GroovesharkLink 11578982 Link http   tinysong com d3wI title Feel Good Inc - Gorillaz description Feel Good Inc by Gorillaz on Grooveshark link http   listen grooveshark com s Feel Good Inc 1UksmI pubDate Wed  28 Apr 2010 02 25 30 -0400 pubTime 1272435930

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After deserializing the JSON  you have a python object  Use the regular object methods   In this case you have a list made of dictionaries   json object 0  items    json object 0   title     etc

User · Answer

Adding another solution  Python 3  - Iterating over json files in a directory and on each file iterating over all objects and printing relevant fields  See comments in the code  import os json  data path     path to your json files       1  Iterate over directory directory   os fsencode data path  for file in os listdir directory       filename   os fsdecode file        2  Take only json files     if filename endswith  quot  json quot            file full path data path filename           3  Open json file          with open file full path  encoding  utf-8   errors  ignore   as json data              data in file   json load json data  strict False                4  Iterate over objects and print relevant fields             for json object in data in file                  print  quot ttl   s  desc   s quot     json object  title   json object  description

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For Python 3  you have to decode the data you get back from the web server  For instance I decode the data as utf8 then deal with it      example of json data object group with two values of key id jsonstufftest      group    id   2   id   3       always set your headers headers     User-Agent    Moz  amp  Woz      the url you are trying to load and get json from url    http   www cooljson com cooljson json     in python 3 you can build the request using request Request req   urllib request Request url None headers     try to connect or fail gracefully try      response   urllib request urlopen req    new python 3 code -jc except      exit  could not load page  check connection      read the response and DECODE html response read   decode  utf8     new python3 code    now convert the decoded string into real JSON loadedjson   json loads html     print to make sure it worked print  loadedjson    works like a charm    iterate through each key value for testdata in loadedjson  group        print  accesscount  id      should print 2 then 3 if using test json   If you don t decode you will get bytes vs string errors in Python 3

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I believe you probably meant   from   future   import print function  for song in json object        now song is a dictionary     for attribute  value in song items            print attribute  value    example usage   NB  You could use song iteritems instead of song items if in Python 2

User · Answer

for iterating through JSON you can use this   json object   json loads json file  for element in json object       for value in json object  Name OF YOUR KEY ELEMENT            print json object  Name OF YOUR KEY ELEMENT    INDEX OF VALUE    VALUE

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Your loading of the JSON data is a little fragile  Instead of   json raw  raw readlines   json object   json loads json raw 0     you should really just do   json object   json load raw    You shouldn t think of what you get as a  JSON object   What you have is a list  The list contains two dicts  The dicts contain various key value pairs  all strings  When you do json object 0   you re asking for the first dict in the list  When you iterate over that  with for song in json object 0    you iterate over the keys of the dict  Because that s what you get when you iterate over the dict  If you want to access the value associated with the key in that dict  you would use  for example  json object 0  song    None of this is specific to JSON  It s just basic Python types  with their basic operations as covered in any tutorial

[python] Iterating through a JSON object

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