Weekly backup.

20220527190024-fonction_zip.org

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+:PROPERTIES:
+:ID:       acda43fa-70be-4939-9128-47114e48e4cb
+:mtime:    20220528183525
+:ctime:    20220527190024
+:END:
+#+title: Fonction zip
+
+* Introduction
+Fonction /built-in/ permettant l'itération de plusieurs /iterable/ à la fois :
+ * Si les /iterable/ n'ont pas le même nombre d'éléments, /zip/ arrêtera une fois le plus court atteint.
+
+* Howto
+** /Iterable/ de tailles différentes
+#+BEGIN_SRC python :results output
+firsts = ["Anna", "Bob", "Charles", "Chris"]
+middles = ["Z.", "A.", "G."]
+lasts = ["Smith", "Doe", "Evans"]
+
+for it in zip(firsts, middles, lasts):
+    print(f'{type(it)=}')
+    first, *others = it
+    print(f"'{first} {others}'")
+#+END_SRC
+#+RESULTS:
+: type(it)=<class 'tuple'>
+: 'Anna ['Z.', 'Smith']'
+: type(it)=<class 'tuple'>
+: 'Bob ['A.', 'Doe']'
+: type(it)=<class 'tuple'>
+: 'Charles ['G.', 'Evans']'
+
+#+BEGIN_SRC python :results output
+firsts = ["Anna", "Bob", "Charles", "Chris"]
+middles = ["Z.", "A.", "G."]
+lasts = ["Smith", "Doe", "Evans"]
+
+for first, middle, last in zip(firsts, middles, lasts):
+    print(f"'{first} {middle} {last}'")
+#+END_SRC
+#+RESULTS:
+: 'Anna Z. Smith'
+: 'Bob A. Doe'
+: 'Charles G. Evans'
+
+** Création d'un /dict/ avec /zip/
+#+BEGIN_SRC python :results output
+firsts = ["Anna", "Bob", "Charles"]
+lasts = ["Smith", "Doe", "Evans"]
+print(f'{dict(zip(firsts, lasts))=}')
+#+END_SRC
+#+RESULTS:
+: dict(zip(firsts, lasts))={'Anna': 'Smith', 'Bob': 'Doe', 'Charles': 'Evans'}
+
+* Références
+ * [[https://mathspp.com/blog/pydonts/zip-up][Zip up - Pydon't]]