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I have a data frame with following structure:

df.columns

Index(['first_post_date', 'followers_count', 'friends_count', 'last_post_date','min_retweet', 'retweet_count', 'screen_name', 'tweet_count',  'tweet_with_max_retweet', 'tweets', 'uid'],
      dtype='object')

Inside the tweets series, each cell is another data frame containing all the tweets of an user.

df.tweets[0].columns

Index(['created_at', 'id', 'retweet_count', 'text'], dtype='object')

I want to perform calculation on the tweets of each users, for example, finding average number of retweets of each user, the tweet with maximum retweets etc.

How can I do these?

Edit link to sample data

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  • $\begingroup$ Can you upload a few lines of data so we can present a working solution? $\endgroup$ – Emre May 26 '17 at 18:35
  • $\begingroup$ @Emre, link added $\endgroup$ – Rakib May 26 '17 at 19:04
  • $\begingroup$ @Emre, I loaded the data in data frame using pandas.read_pickle(filename) $\endgroup$ – Rakib May 26 '17 at 19:50
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In the absence of a MultiIndex (the Right Way$^\mathrm{TM}$), the apply method can do what you want; e.g.

df.assign(
    max_retweet=df.tweets.apply(lambda x: x.retweet_count.argmax('retweet_count')),
    avg_retweet=df.tweets.apply(lambda x: x.retweet_count.mean())
)


       avg_retweet  max_retweet  
26662     0.045476          187  
32316     0.821538          427  
25879     0.633681          583  
43411     0.112465          421  
28840     0.472222            8

Also, don't share data with pickle; it's dangerous.

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  • $\begingroup$ I have a similar data structure and apply method seems not work for my situation. Can you help me to solve my problem? hackmd.io/s/ryrCfAjZG $\endgroup$ – Po-Ying Chen Dec 11 '17 at 9:40
  • $\begingroup$ Please post a new question at StackOverflow. $\endgroup$ – Emre Dec 11 '17 at 18:04

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