python - Trying to understand UnmappedInstanceError using SQLAlchemy -

i'm trying fill table in sql data in dataframe below. code functions expected when use other dataframes same columns , datatypes, dataframe alone error sqlalchemy.orm.exc.unmappedinstanceerror: class 'builtins.list' not mapped results line session.add([yc_node_hist(fk_yc_update = listofindices3[i],curve_date = row1['date'], tenor = row1['year'], abrv = row1['value'])]) . using automap() map table yc_node_hist class. my main problem can't understand error means.

             date        year      value     abbrv 0      2005-01-04  0.08333333   4.709456      gbp 1      2005-01-05  0.08333333   4.713099      gbp 2      2005-01-06  0.08333333   4.707237      gbp 3      2005-01-07  0.08333333   4.705043      gbp 

yc_node_hist:

create table yc_node_hist (     id bigint identity(1,1) primary key,     fk_yc_update bigint not null foreign key references yc_update(id),     curve_date date not null,     tenor float not null,     abrv float not null ) 

the code using:

engine2 = yielddata.connectionengine() session = session(bind=engine, expire_on_commit=false) (i1, row1), (i2, row2) in pairwise(df.iterrows()):     if row1['abbrv'] == row2['abbrv'] , isinstance(row1['value'], float)==1:         print(row1)         session.add([yc_node_hist(fk_yc_update = listofindices3[i],curve_date = row1['date'], tenor = row1['year'], abrv = row1['value'])])