# Tree('S', ['copy', Tree('List', [...]), to, Tree('Item', [...])])
t2 = Tree('S', [
'copy',
Tree('List', [
Tree('Item', ['f1']),
Tree('List',
[Tree('Item', ['f2']),
Tree('List', [Tree('Item', ['f3'])])])
]), 'to',
Tree('Item', ['folder'])
])
print(t2)
print(t2.flatten())
print(type(t2.flatten()))
print(t2.collapse_unary())
max_subtree = Tree('', [])
for subtree in t2.subtrees(filter=lambda x: x.label() == 'List'):
if len(subtree.flatten().pos()) > len(max_subtree.pos()):
max_subtree = subtree
print(max_subtree)
'''
tmp = t2
i =
while tmp.label() != 'List':
i += 1
tmp = tmp.pos()
print("the " + str(i) + " time:")
print(tmp)
print(type(tmp))
# Tree('S', ['copy', Tree('List', [...]), to, Tree('Item', [...])])
t2 = Tree('S', [
'copy',
Tree('List', [
Tree('Item', ['f1']),
Tree('List', [
Tree('Item', ['f2']),
Tree('List', [Tree('Item', ['f3'])])])]),
'to',
Tree('Item', ['folder'])])
print(t2)
print(t2.flatten())
print(type(t2.flatten()))
print(t2.collapse_unary())
max_subtree = Tree('', [])
for subtree in t2.subtrees(filter = lambda x: x.label() == 'List'):
if len(subtree.flatten().pos()) > len(max_subtree.pos()):
max_subtree = subtree
print(max_subtree)
'''
tmp = t2
i =
while tmp.label() != 'List':
i += 1
tmp = tmp.pos()
print("the " + str(i) + " time:")
