brunns-row 2.1.0

Convenience wrapper for DB API and csv.DictReader rows, and similar.

brunns-row

Convenience wrapper for DB API and csv.DictReader rows, and similar, inspired by Greg Stein's lovely dtuple module.

Setup

Install with pip:

pip install brunns-row

(As usual, use of a venv or virtualenv is recommended.)

Usage

The basic approach is to create a wrapper object from some kind of description - typically a DBAPI cursor's description, or a csv.DictReader's fieldnames attribute - then to use the wrapper's wrap(row) method to wrap each row. wrap(row) returns an object from which you can access the row's fields as attributes. A couple of simple examples:

DB API

cursor = conn.cursor()
cursor.execute("SELECT kind, rating FROM sausages ORDER BY rating DESC;")
wrapper = RowWrapper(cursor.description)
rows = [wrapper.wrap(row) for row in cursor.fetchall()]
for row in rows:
    print(row.kind, row.rating)

csv.DictReader

reader = csv.DictReader(csv_file)
wrapper = RowWrapper(reader.fieldnames)
rows = [wrapper.wrap(row) for row in reader]
for row in rows:
    print(row.kind, row.rating)

Attributes names are simply the column names where possible, converted to valid identifiers where necessary by replacing invalid characters with "_"s, prefixing any leading numerics with "a_", and de-duplicating where necessary by adding numeric suffixes.

Developing

Requires tox. Run make precommit tells you if you're OK to commit. For more options, run:

make help

Releasing

Requires hub, setuptools, wheel and twine. To release version n.n.n, first update the version number in setup.py, then:

version="n.n.n" # Needs to match new version number in setup.py.
git checkout -b "release-$version"
make precommit && git commit -am"Release $version" && git push --set-upstream origin "release-$version" # If not already all pushed, which it should be.
hub release create "V$version" -t"release-$version" -m"Version $version"
python setup.py sdist bdist_wheel
twine upload dist/*$version*
git checkout master
git merge "release-$version"