Question

What is the pythonic way to perform this loop. I’m trying to pick a random key that will return a subtree and not the root. Hence: ‘parent == None’ cannot be true. Nor can ‘isRoot==True’ be true.

thekey = random.choice(tree.thedict.keys())
while (tree.thedict[thekey].parent == None)or(tree.thedict[thekey].isRoot == True):
        thekey = random.choice(tree.thedict.keys())
.......

edit: it works now

Answer 1

key = random.choice([key for key, subtree in tree.thedict.items()
                         if subtree.parent and not subtree.isRoot])

(Corrected after comments and question edition)