【20191201】SKlearn：DictVectorizer

from sklearn.feature_extraction import DictVectorizer
measurements = [
   {'city': 'Dubai', 'temperature': 33.},
    {'city': 'London', 'temperature': 12.},
   {'city': 'Francisco', 'temperature': 18.},
    {'city': 'San Francisco', 'temperature': 11},
]
vec = DictVectorizer()
print(vec.fit_transform(measurements).toarray())
print(vec.get_feature_names())