train_data: SFrame
train_data[train_data['zipcode']=='98039']
train_data[train_data['zipcode']=='98039']['price']
求zipcode为98039时，平均price
train_data[train_data['zipcode']=='98039']['price'].mean()
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train_data: SFrame
train_data[train_data['zipcode']=='98039']
train_data[train_data['zipcode']=='98039']['price']
求zipcode为98039时，平均price
train_data[train_data['zipcode']=='98039']['price'].mean()
相关文章：