Le module Pandas
Cela devient vite fastidieux, du Python "pur" pour manipuler des données...
Il existe heureusement des modules spécialement destinés à la manipulation et au traitement de données en Python : par exemple, le module Pandas.
C'est le module "de référence" pour tout ce qui est analyse de données, "Big data", etc... en Python.
1. Principe
Cette introduction à l'utilisation du module se fera avec ce fichier de données ( à enregistrer dans votre zone personnelle ).
Le module n'est pas forcément installé sur les ordinateurs du lycée, mais est disponible dans les éditeurs du site : penser à l'installer au préalable, et charger les fichiers nécessaires dans
le système de fichiers virtuel du navigateur.
1.1. Dataframe
Après avoir importé le module en début de script, on crée, à partir de données stockées par exemple dans un fichier .csv
, un tableau de données appelé dataframe :
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La première ligne indique le nom des colonnes du tableau; chaque ligne commence par un index ( commençant à 0 ) permettant de la repérer
Le dataframe contenant de très nombreuses données, Pandas ne les affiche pas toutes par défaut : les points de suspension indiquent des données non affichées.
1.2. Informations sur les données
On peut obtenir de nombreuses informations sur le tableau de données lui-même.
Dé-commenter chaque ligne ci-dessous pour observer le résultat de leur exécution :
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1.3. Sélectionner une ou plusieurs colonnes
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Dans Pandas, une colonne est plus qu'une simple liste. C'est un objet sur lequel il est possible de faire les mêmes opérations que sur un dataframe :
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Remarque : NaN
signifie Not a Number et indique qu'il y a probablement une valeur manquante dans la table () il doit y avoir un pays pour lequel on n'a pas
d'information sur sa population en 2016.)
1.4. Sélection de lignes suivant une ou plusieurs condition(s)
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1.5. Trier un tableau
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1.6. Enlever les valeurs manquantes
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1.7. Ajouter une nouvelle colonne
On veut mesurer par exemple l'augmentation de la population , en pourcentage, entre 1960 et 2016. On va créer une nouvelle colonne dans laquelle on écrira une formule de calcul,
puis on ajoutera cette colonne au tableau :
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2. Application : une base de données de films ( IMDb )
Pour cette application, vous utiliserez ce fichier de données.
- Créer un dataframe à partir du fichier de données :
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- Former un nouveau tableau appelé movies_df2 en ne gardant que les colonnes suivantes, et les renommer en français, puis afficher le nouveau tableau :
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- Enlever les lignes présentant des valeurs manquantes :
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- Ne garder que les films sortis à partir de l'année 2000 :
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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- Afficher cette table en classant du moins bien noté au mieux noté :
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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- Lequel de ces films a levé la plus grosse recette (vous pouvez vous aider d'un tri pour obtenir ce résultat) ?
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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- Créer une nouvelle colonne qui va mesurer la rentabilité (Recette - Budget) de chaque film et l'ajouter au tableau (ignorer les éventuels avertissements) :
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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- Trier le tableau pour afficher les films du moins rentable au plus rentable :
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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- Quels sont les films dont le score IMDb est supérieur à 8 et qui n'ont pourtant pas été rentables ?
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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SOLUTION