add method lines_by_attribute()
add method lines_by_attribute()

and make lines() to use this method. You can use lines() (or lines_by_attribute() without attr. specification) the same way as former graph_edges() or lines_by_attribute() if you want to select specific lines, e.g. lines_by_attribute('line_aggr')

openego/eDisGo,openego/eDisGo