omni.py 文件源码

def parse(omni_fname,
          colspecs=COLSPECS,
          names=NAMES,
          na_values=NA_VALUES):
    """
    Parse the OMNI data record *omni_fname* and return a
    :class:`DataFrame`. To parse, use the fixed columns *colspecs*,
    the column identifiers *names*, and acceptable NaN column mapping
    *na_values*.
    """
    df = PD.read_fwf(omni_fname,
                     colspecs=colspecs,
                     header=None,
                     names=names,
                     na_values=na_values,
                     parse_dates={'date': [0, 1, 2, 3]},
                     date_parser=lambda x: datetime.strptime(x, '%Y %j %H %M'))
    df.set_index('date', inplace=True)
    return df