Countif and Sort, 1 million de fois plus rapide

De temps en temps, je dois faire face à des CSV qui comptent des millions de lignes chacun, que les données proviennent de large datasets ou de scraping.

Il m'arrive d'extraire les followers d'un compte Instagram, afin de savoir avec quels comptes ils sont en concurrence sur leur audience.

Par exemple, un compte de 10 000 followers - et, à peu près, chaque followers suivait en moyenne 800 comptes également : cela fait 8 000 000 de lignes au total. Et ces données étaient compilées dans un CSV, pas dans une base de données (oup's).

La question est la suivante : quels sont les comptes les plus suivis par les followers d'un compte donné ?

Sur Excel, c'est une question de base de COUNTIF.

Excel ne prend en compte qu'un peu plus de 1 000 000 de lignes. Plus encore - essayez d'effectuer un =COUNTIF() sur 1 million de lignes. Vous obtiendrez le résultat deux jours plus tard.

Donc ici, je partage juste un petit script Python, qui fait le travail en moins de 2 minutes. Je laisse des commentaires pour expliquer le script ci-dessous.

import csv
import collections
id_followed = collections.Counter() ## we initialize the COUNTIF column as a Counter
outFile = open('occurences.csv','w') ## first output file
outFileSorted = open('sorted.csv','w') ## second output file, sorted
listLines = []
## the output-followings.csv file structure was:
## id_follower, id_following, username_following
## 123456, 7890987, following1
## 123456, 0987890, following2
with open('output-followings.csv','r') as input_file:
   for row in csv.reader(input_file, delimiter=','):
       print(row[2]) ## prints in console the username
       id_followed[row[2]] += 1 ## increment in the Counter corresponding to the username
with open('sorted.csv','w') as sortedfile:
    writer = csv.writer(sortedfile)
    for key, value in id_followed.most_common(1000): # most_common() gives us the possibility to directly sort the Counter
        line = str(key) + ',' + str(value)
        writer.writerow(line.split()) # we write in the sorted.csv file
with open('occurences.csv','w') as csvfile:
   writer = csv.writer(csvfile)
   for key, value in id_followed.items():
       line = str(key) + ',' + str(value)
       writer.writerow(line.split()) # we write all the rows in the outFile
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