address.py

import six
import pyarrow as pa
import pandas as pd

adr_schema = pa.schema([
    pa.field('pobox', pa.string()),
    pa.field('street2', pa.string()),
    pa.field('street1', pa.string()),
    pa.field('city', pa.string()),
    pa.field('state', pa.string()),
    pa.field('postal', pa.string()),
    pa.field('country', pa.string()),
])

adr_data = """pobox,street2,street1,city,state,postal,country
,,10475 Little Patuxent Pkwy,Columbia,MD,21044,US
"""

df = pd.read_csv(six.StringIO(adr_data))
dt = pa.Table.from_pandas(df, schema=adr_schema)
out = six.StringIO()
dt.to_pandas().to_csv(out)
print(out.getvalue())