Parsing CSV file with Pandas in Python 3

Question

I am trying to parse a movie database with Python 3. How can I parse genres of a movie with different variables? For example:

1,Toy Story (1995),Adventure|Animation|Children|Comedy|Fantasy
2,Jumanji (1995),Adventure|Children|Fantasy

First value is movie_id, second is movie_name, and the third values are genres but I want to parse them as separate variables that belong to corresponding movie. In other words, I want second separator to my database as "|". How can I achieve this? Here is my code:

import numpy as np
import pandas as pd
header = ["movie_id", "title", "genres"]
movie_db = pd.read_csv("movielens/movies.csv", sep=",", names=header)

jezrael · Accepted Answer · 2017-11-12 12:34:35Z

You can use separator ,| but is necessary first row have to contains all possible genres:

df = pd.read_csv("movielens/movies.csv", sep="[,|]", header=None, engine='python')
print (df)
   0                 1          2          3         4       5        6
0  1  Toy Story (1995)  Adventure  Animation  Children  Comedy  Fantasy
1  2    Jumanji (1995)  Adventure   Children   Fantasy    None     None

But here is better create new columns by categories and set to 1 if category exist in row by get_dummies and add to original columns by join:

movie_db = pd.read_csv("movielens/movies.csv", sep=",", names=header)

df =  movie_db.join(movie_db.pop('genres').str.get_dummies())
print (df)
   movie_id             title  Adventure  Animation  Children  Comedy  Fantasy
0         1  Toy Story (1995)          1          1         1       1        1
1         2    Jumanji (1995)          1          0         1       0        1

But if need columns is possible use split by |:

df = movie_db.join(movie_db.pop('genres').str.split('|', expand=True))
print (df)
   movie_id             title          0          1         2       3        4
0         1  Toy Story (1995)  Adventure  Animation  Children  Comedy  Fantasy
1         2    Jumanji (1995)  Adventure   Children   Fantasy    None     None

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