I am trying to transcribe a sentence into a list of categories (one for each word in the sentence), but keep getting "AttributeError: 'NoneType' object has no attribute 'append'". Any ideas?
categories = {
'direction':["north","south","east","west","down","up","left","right","back"],
'verbs': ["go","stop","kill","eat"],
'stop_words': ["the","in","of","from","at","it"],
'nouns': ["door","bear","princess","cabinet"],
'numbers': ["0","1","2","3","4","5","6","7","8","9"]
}
sentence = "bear go left eat from cabinet 2."
words = sentence.split()
categorised_sentence = []
for word in words:
print "---Looking at word:", word
for category in categories.keys():
if word in categories.get(category):
print "===The category is:", category
categorised_sentence = categorised_sentence.append(category)
print "***categorised_sentence is: ", categorised_sentence
else:
print "hmm..."
