Das deutsche Python-Forum

Code: Alles auswählen

>>> def gen(iterable):
	for elem in iterable:
		yield elem

		
>>> li = [1,2,3,4,5]
>>> gen(li)
<generator object at 0x00E8C9E0>
>>> it = gen(li)
>>> it.next()
1
>>> it.next()
2
>>> it = gen((1,2))
>>> it.next()
1
>>> it.next()
2
>>> it.next()

Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    it.next()
StopIteration
>>> for elem in gen(li):
	print elem

	
1
2
3
4
5
>>> 

Code: Alles auswählen

import List
type Stadt = String

remove :: Stadt -> [Stadt] -> [Stadt]
remove y xs = xs \\ [y]

permut :: [Stadt] -> [[Stadt]]
permut [] = [[]]
permut xs = [ y:ys | y <- xs , ys <- permut (remove y xs) ]

main = putStrLn . unlines . map show $ permut ["Berlin", "Tokyo", "New York"]

Code: Alles auswählen

from pprint import pprint


def remove(y, xs):
    result = list(xs)
    result.remove(y)
    return result


def permut(xs):
    if not xs:
        return [[]]
    else:
        #      [ y  : ys |   y <- xs ,   ys <- permut (remove y xs) ]
        return [[y] + ys for y in xs for ys in permut(remove(y, xs))]


pprint(permut(['Berlin', 'Tokyo', 'New York']))