support creating DataFrame with Series with different index about raccoon HOT 2 CLOSED

class DataFrame(rc.DataFrame):
    def __init__(self, series_list=None): # series_list is a list of rc.Series
        all_index = set()
        #data = {}
        columns = []

        for series in series_list:
            all_index |= set(series.index)
            columns.append(series.id)

        index = sorted(all_index)

        super(DataFrame, self).__init__(index=index, columns=columns)

        for i in index:
            data = {}
            for series in series_list:
                if i in series.index:
                    data[series.id] = series[i]
            self.set(indexes=i, values=data)

import raccoon as rc

df1 = rc.DataFrame(data={'close': [9,8,7,6]}, index=[0,2,4,6], sort=True)
df2 = rc.DataFrame(data={'open': [1,2,3,4,5,6,7]}, index=[0, 1, 2, 3, 4, 5, 6], sort=True)

df1.set(df2.index, df2.columns[0], df2.data[0])
df1.show()

  index    close    open
-------  -------  ------
      0        9       1
      1                2
      2        8       3
      3                4
      4        7       5
      5                6
      6        6       7