如何识别NLTK树类型的对象，然后对其进行解析？

from nltk.tree import Tree, ParentedTree

# 示例树对象
tree = Tree('S', [Tree('NP', ['I']), Tree('VP', ['love', Tree('NP', ['NLTK'])])])

# 判断树对象类型
if isinstance(tree, Tree):
    print("This is a Tree object.")
    print("Label:", tree.label())
    print("Leaves:", tree.leaves())
    print("Subtrees:")
    for subtree in tree.subtrees():
        print(subtree)

elif isinstance(tree, ParentedTree):
    print("This is a ParentedTree object.")
    print("Label:", tree.label())
    print("Leaves:", tree.leaves())
    print("Subtrees:")
    for subtree in tree.subtrees():
        print(subtree)

else:
    print("Unknown tree type.")

# 解析操作示例
print("Parsing operations:")
for subtree in tree.subtrees():
    if subtree.label() == 'NP':
        print("Found NP subtree:", subtree)
        # 其他解析操作...