data = Instance(ColumnDataSource)
name = String(help="Name of the attribute the spec provides.")
columns = List(String)def __init__(self, columns=None, df=None, iterable=None, default=None, **properties):
columns = self._ensure_list(columns)
After Change
data = Instance(ColumnDataSource)
name = String(help="Name of the attribute the spec provides.")
columns = Either(ColumnLabel, List(ColumnLabel))def __init__(self, columns=None, df=None, iterable=None, default=None, **properties):
columns = self._ensure_list(columns)