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pandas导入csv转化成polars表

dtypes_putie = {'ECI':'int64','场景':'str'}

defread_putie(dtypes):
#读取普铁
pt = pd.read_csv(pth_pt,encoding='gbk',usecols=dtypes.keys(),dtype=dtypes)
pt = pl.from_dataframe(pt).select(dtypes.keys()).rename({'ECI':'eci','场景':'普铁线路'}).unique(subset='eci',
keep='first')
pt = pt.with_columns(('普铁'+'_'+ pl.col('普铁线路')).alias('普铁线路'))
returnpt