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原数据看附件，想对CITY列为Shenzhen的行打标记
df2['group']=np.where((df['city']=='Shenzhen'),'high','low')会报错
ValueError: Length of values does not match length of index
然后如果用df2.loc[(df['city']=='Shenzhen'),'sign']=1会报错IndexingError: (0 False1 False2 False3 True4 False5 False6 FalseName: city, dtype: bool, 'sign')是哪里出问题
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