Python: How To Append Generator Iteration Values To A List

I have a simple generator to give me permutations of a set of coordinates. I wish to save each new permutation to an element in an array using the code below: import random def po

Solution 1:

Your generator does not yield new lists, it yields the same list over and over again. When you append that yielded reference to a you only get to see the same original list, in it's most recently shuffled form, over and over again.

Yield a copy instead:

def poss_comb(coord):
    coord = coord[:]  # use a local copy of the list
    random.shuffle(coord)
    yield coord

or create a random sort instead of using inplace shuffling with the sorted() function:

def poss_comb(coord):
    yield sorted(coord, key=lambda k: random.random())