def exstractFeature1(text):
    return [len(text)]
 
class HasChar(object):
    def __init__(self, ch):
        self.ch = ch
    def __call__(self, text):
        return [0 if text.find(self.ch)<0 else 1]
 
 
class FeatureExtractor(object):
    def __init__(self, features):
        self._features = features
 
    def __call__(self, text):
        new_feature = []
        for f in self._features:
            new_feature.extend(f(text))
        return new_feature
 
 
d = {
 'Length': exstractFeature1,
 'HasA': HasChar('A'),
 'HasB': HasChar('B'),
}
 
features = FeatureExtractor(d.values())
print features('HAS') #-> [3, 1, 0]

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