Python method not found, but defined in class

Question

I'm teaching myself (probably my first mistake) classes and methods by converting a sentiment analysis script to use them. I thought I had all of the methods in place, but I keep getting `global name 'get_bigram_word_feats' is not defined` I'm sure I'd be getting an error for `get_word_feats`, too, if it got that far. I'm banging my head against this one big-time. I tried removing `staticmethod` and adding self. What am I doing wrong? Here's my code: ``` def word_feats(words): return dict([(word, True) for word in words]) class SentClassifier: def __init__(self, name, location): self.name = name self.location = location self.fullpath = location + "/" + name def doesexist(self): return os.path.isfile(self.fullpath) def save_classifier(self): rf = open(self.fullpath, 'wb') pickle.dump(self.fullpath, rf) rf.close() def load_classifier(self): sf = open(self.fullpath, 'rb') sclassifier = pickle.load(sf) sf.close() return sclassifier class Training: def __init__(self, neg, pos): self.neg =…

Accepted Answer

All the information you need is in the exception message:

global name 'get_bigram_word_feats' is not defined

(my emphasis)

Python doesn't understand that you want to access that method from the class, since you did not specify the class name as part of the method invocation. As such, it is looking for the function in the global namespace and failed to find it.

If you recall from calling instance methods, you need to prefix the methods with `self.` to make the Python interpreter look in the right place, and this also holds for static methods though you do not specify `self.`, instead you specify the class name.

So to fix this, prefix the call to the method with the class name:

```
return [(Training.get_bigram_word_feats(gf), label) for gf in thelist()]
         ^---+---^
             |
             +-- you need this part
```

Python method not found, but defined in class

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