def permutation(L): 
    if len(L) == 0: 
        return [] 
    if len(L) == 1: 
        return [L]  
    sortie = []
    for i in range(len(L)): 
       m = L[i] 
       ResteListe = L[:i] + L[i+1:]
       for p in permutation(ResteListe): 
           sortie.append([m] + p) 
    return sortie