Programmation fonctionnelle
===========================

list comprehension
------------------

::

    >>> l = [1,2,3,4]
    >>> my_list = [i**2 for i in l]
    >>> my_list
    [1, 4, 9, 16]
    >>> my_list = [ "number_%s" % i for i in l]
    >>> my_list
    ['number_1', 'number_2', 'number_3', 'number_4']

dict comprehension (a/c Py2.7)
------------------------------

::

    >>> name = 'john doe'
    >>> { k: v for v, k in enumerate(name)}
    {' ': 4, 'e': 7, 'd': 5, 'h': 2, 'j': 0, 'o': 6, 'n': 3}

map
---

    appliquer, en une seule instruction, une fonction donnée à tous les
    éléments d'une liste.

::

    >>> def add_5(n):
    ...     return n + 5

    >>> l = [1, 5, 9, 7]

    >>> list(map(add_5, l))
    [6, 10, 14, 12]

 

filter
------

::

    >>> def contains_a(s):
    ...     if 'a' in s:
    ...         return True
    ...     return False
    >>> l =['joe', 'bill', 'patricia', 'pamela', 'eric', 'aragorn']
    >>> filter(contains_a, l)
    ['patricia', 'pamela', 'aragorn']

zip
---

::

    >>> x = ['a', 'b', 'c']
    >>> y = [1, 2, 3]
    >>> zip(x, y)
    [('a', 1), ('b', 2), ('c', 3)]