from dash.dash_table.Format import Format, Group, Scheme, Symbol

columns=[{            
    'id': 'euros',
    'name': 'euros',
    'type': 'numeric',
    'format': Format(
        scheme=Scheme.fixed, 
        precision=2,
        group=Group.yes,
        groups=3,
        group_delimiter=', ',
        decimal_delimiter='.',
        symbol=Symbol.yes, 
        symbol_prefix=u'€')
}]