Parcours de listes
Parcours par valeur
Tout comme les textes, on peut parcourir une liste valeur par valeur :
def parcours_par_valeur ( donnees ):
for val in donnees :
print ( val ) # Quelque chose avec val
Exemple >>> parcours_par_valeur ([ 3 , - 2 , 4 ])
3
-2
4
Vous pouvez tester cette fonction ici
Ce parcours à l'avantage d'avoir une syntaxe plus simple. Par contre, on n'a pas d'information sur l'indice de l'élément regardé dans la liste.
Exercice 3 : longueur
Écrire le code de la fonction longueur
qui prend en paramètre une liste liste
et renvoie le nombre d'éléments qu'elle contient.
Exemples >>> longueur ([])
0
>>> longueur ([ 4 , 5 , 2 ])
3
Exercice 4 : est_dans
Écrire le code de la fonction est_dans
qui prend en paramètres une valeur e
et une liste liste
, et qui renvoie un booléen indiquant si e
est dans liste
(True
) ou pas (False
).
Exemples >>> est_dans ( 4 , [ 2 , 3 ])
False
>>> est_dans ( 3 , [ 2 , 3 ])
True
Parcours par indice
En plus du parcours par valeur, on peut faire un parcours par indice :
def parcours_par_indice ( donnees ):
for i in range ( len ( donnees )):
print ( i , donnees [ i ])
Exemple >>> parcours_par_indice ([ 3 , - 2 , 4 ])
0 3
1 -2
2 4
Vous pouvez tester cette fonction ici
Contrairement au parcours par valeur, celui-ci fonctionne dans tous les cas. La syntaxe est juste un peu plus lourde. Il faut bien faire attention à ne pas confondre l'indice et la valeur associée.
Exercice 5 : indice
Écrire le code de la fonction indice
qui prend en paramètres une valeur e
et une liste liste
, et qui renvoie l'indice de la première occurrence de e
dans liste
s'il y en a une et -1 sinon.
Exemples >>> indice ( "chien" , [ "cheval" , "chat" , "chien" , "canard" ])
2
>>> indice ( 9 , [ 3 , 9 , 14 , - 3 , 78 ])
1
>>> indice ( 9 , [ 3 , 2 , 9 , 14 , 9 , 9 ])
2
>>> indice ( 1 , [ 3 , 2 , 9 , 14 , 9 , 9 ])
-1
Exercice 6 : nb_occurrences
Écrire le code de la fonction nb_occurrences
qui prend en paramètres une valeur e
et une liste liste
, et qui renvoie le nombre d'occurrences de e
dans liste
.
Exemples >>> nb_occurrences ( 3 , [ 5 , 1 , 3 , 9 , 3 , 8 , 3 , 3 ])
4
>>> nb_occurrences ( 'ba' , [ 'ba' , 'bo' ])
1
>>> nb_occurrences ( 'ab' , [ 'ba' , 'bo' ])
0
Exercice 7 : maximum
Écrire le code de la fonction maximum
qui prend en paramètres une liste non vide nombres
d'entiers et qui renvoie la plus grande valeur de nombres
.
Exemples >>> maximum ([ 5 , 1 , 8 , 14 , 2 ])
14
>>> maximum ([ 15 ])
15
>>> maximum ([ - 9 , - 27 , - 2 , - 48 ])
-2
>>> maximum ([ 9 , 2 , - 57 , 1 , 8 ])
9
Indices
Indice 1
Il faut mémoriser la plus grande valeur vue jusqu'à la valeur actuelle lors du parcours de la liste.
Indice 2
Il faut initialiser cette valeur avec une valeur de la liste.
Indice 3
Puisque la liste n'est pas vide, il y a forcément un premier élément...
Indice 4
Il faut déterminer quand il faut mettre à jour la plus grande valeur observée jusque là.
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Exercice 8 : moyenne
Écrire le code de la fonction moyenne
qui prend en paramètres une liste non vide valeurs
de nombres et qui renvoie la moyenne des valeurs de valeurs
. Vous ne devez pas utiliser len
.
Exemples >>> moyenne ([ 20 ])
20.0
>>> moyenne ([ 20 , 10 ])
15.0
>>> moyenne ([ 5 , 5 , 5 , 5 , 5 ])
5.0
>>> moyenne ([ 3 , 2 , 5 , 1 , 7 , 4 ])
3.6666666666666665
Indices
Indice 1
Il faut la somme des valeurs et le nombre de valeurs.
Indice 2
Il faut donc deux variables.
Indice 3
Lorsqu'on regarde une nouvelle valeur, il faut l'ajouter au total et augmenter de 1 le nombre de valeurs.
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Exercice 9 : indice_du_max
Écrire une fonction position_max
qui prend une liste non vide nombres
d'entiers et qui renvoie l’indice du maximum des valeurs de nombres
. S’il apparaît plusieurs fois, c’est l'indice de la première occurrence qui est renvoyée.
Exemples >>> indice_du_max ([ 5 , 1 , 8 , 14 , 2 ])
3
>>> indice_du_max ([ 15 ])
0
>>> indice_du_max ([ - 9 , - 27 , - 2 , - 48 ])
2
>>> indice_du_max ([ 9 , 2 , - 57 , 1 , 9 ])
0
Indices
Indice 1
Il faut déjà savoir trouver le maximum.
Indice 2
Il faut ensuite penser à mémoriser l'indice de la plus grande valeur observée.
Indice 3
On peut le faire en ne faisant qu'un seul parcours de la liste.
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# Tests
(insensible à la casse)(Ctrl+I)