解决办法：

sys:1: DtypeWarning: Columns (0,19) have mixed types. Specify dtype option on import or set low_memory=False.

设置：low_memory=False

data=pd.read_csv('LoanStats_2016Q4.csv',skiprows=1,low_memory=False)

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sys:1: DtypeWarning: Columns (0,19) have mixed types. Specify dtype option on im