15-03-2019

docs/Programmation/Python/set.md

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+# Set
+
+
+
+Une liste est une collection **non ordonnée** et **non indexée**. On ne peut pas modifier un item, mais on peut en ajouter.
+
+
+
+##### Créer un set:
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set
+{'alpha', 'beta', 'gamma'}
+```
+
+```python
+# Constructor set()
+>>> un_set = set(("alpha", "beta", "gamma"))
+>>> un_set
+{'gamma', 'alpha', 'beta'}
+```
+
+##### Ajouter un item:
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set.add("delta")
+>>> un_set
+{'gamma', 'alpha', 'beta', 'delta'}
+```
+
+##### Ajouter plusieurs items:
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set.update(["delta","zeta","epsilon"])
+>>> un_set
+{'zeta', 'alpha', 'beta', 'delta', 'gamma', 'epsilon'}
+```
+
+##### Longueur d'un set:
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> print(len(un_set))
+3
+```
+
+##### Supprimer un item (remove):
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set.remove("beta")
+>>> un_set
+{'gamma', 'alpha'}
+```
+
+##### Supprimer un item (discard):
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set.discard("beta")
+>>> un_set
+{'gamma', 'alpha'}
+```
+
+##### Vider un set:
+
+```python
+>>> un_set = {"alpha", "beta", "gamma"}
+>>> un_set.clear()
+>>> un_set
+set()
+```
+
+##### Supprimer un set:
+
+```python
+>>> del un_set
+>>> un_set
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+NameError: name 'un_set' is not defined
+```
+
+##### Boucle:
+
+```python
+un_set = {"alpha", "beta", "gamma"}
+for x in un_set:
+    print(x)
+
+alpha
+beta
+gamma
+```
+
+##### Test si un item est présent dans le set:
+
+```python
+un_set = {"alpha", "beta", "gamma"}
+print("alpha" in un_set)
+
+True
+```
+
+
+
+#### Méthodes:
+
+| Méthodes                      | Description |
+| ----------------------------- | ----------- |
+| add()                         |             |
+| clear()                       |             |
+| copy()                        |             |
+| difference()                  |             |
+| difference_update()           |             |
+| discard()                     |             |
+| intersection()                |             |
+| intersection_update()         |             |
+| isdisjoint()                  |             |
+| issubset()                    |             |
+| issuperset()                  |             |
+| pop()                         |             |
+| remove()                      |             |
+| symmetric_difference()        |             |
+| symmetric_difference_update() |             |
+| union()                       |             |
+| update()                      |             |
+