Missing steps in the code

[maiskovich]

While running I get AttributeError: 'str' object has no attribute 'subtrees'

In the example the code just pass a string and then do for s in t.subtrees(lambda t: t.label() == 'NP'): without parsing or anything like that which results in the error described above

[HichemBouric]

Yes.. it's definetly missing.. you have to fill the gaps on your own