age_range_features.py

def get_word_features(word, word_id):
    word_lower = word.lower()
    
    return [word_id + '=' + word_lower, 
            word_id + '.is_digit=%s' % word_lower.isdigit(), 
            word_id + '.has_digit=%s' % (bool(re.search('\d+', word_lower))), 
            word_id + '.is_number=%s' % (bool(re.match(r'\b\d+\b', word_lower))), 
            word_id + '.has_plus=%s' % (word_lower[-1] == '+'), 
            word_id + '.is_range=%s' % (bool(re.match(r'\b[0-9]+-[0-9]+\b', word_lower))), 
            word_id + '.is_age=%s' % (word_lower[:3] == 'age'), 
            word_id + '.is_age_group=%s' % (word_lower in ['kid', 'child', 'newborn', 'adult', 'teen', 'toddler', 'tween', 'baby', 'infant', 'senior']), 
            word_id + '.is_numeric=%s' % (word_lower in ['one','two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten'])]

def word2features(sentence, pos):
    features = get_word_features(sentence[pos], 'curr_word')
    
    if pos > 0:
        features += get_word_features(sentence[pos - 1], 'prev_word')
    else:
        features.append('BOS')
        
    if pos < len(sentence) - 1:
        features += get_word_features(sentence[pos + 1], 'next_word')
    else:
        features.append('EOS')
        
    return features

def sent2features(sent):
    return [word2features(sent, i) for i in range(len(sent))]