貌似Python標準庫并沒提供對樹的操作，這是基本的數據結構操作，用遞歸很容易實現：
def tree_find(tree, value):
def tree_rec(tree, iseq):
if isinstance(tree, list):
for i, child in enumerate(tree):
r = tree_rec(child, iseq + [i])
if r is not None:
return r
elif tree == value:
return iseq
else:
return None