SQLAlchemy-从元组字典插入记录

Question

使用如下所示的字典，我正在使用sqlalchemy将记录插入到PostgreSQL数据库中。

{'Date': ('08-Dec-2018', '08-Jan-2019'), 'Volume/Length': ('23.19', '22.70'), 'Length/Width': ('2.13', '5.22'), 'Weight gm': ('1.32', '1.02')}

对于一条记录，我可以执行以下操作

from sqlalchemy import Table, MetaData, Column, Date, String, Numeric
from sqlalchemy import create_engine

db_string = "postgres://postgres:crytpticpassword@localhost:5432/test"
db = create_engine(db_string)
meta = MetaData(db)

with db.connect() as conn:
    if not db.dialect.has_table(db, "table1"):
        table = Table("table1", meta,
                      Column('date', Date, primary_key=True),
                      Column('volume_to_length', Numeric),
                      Column('length_to_width', Numeric),
                      Column('weight_gm', Numeric))
        table.create()
    else:
        table = Table("table1", meta)
    insert_statement = table.insert().values(
        date="08-Dec-2018", volume_to_length=23.19, length_to_width=2.13, weight_gm=1.32)
    conn.execute(insert_statement)

    # read records
    select_statement = table.select()
    result_set = conn.execute(select_statement)
    for r in result_set:
        print(r)

我该如何以编程方式遍历字典并以pythonic方式逐条插入记录？还有一种方法可以插入许多记录吗？