First working version

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/python
+# Edit at https://www.toptal.com/developers/gitignore?templates=python
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# End of https://www.toptal.com/developers/gitignore/api/python

README.md

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+# A small script that converts CSV output from Sparebanken Sør to a format that YNAB can import
+
+Usage:
+
+```bash
+python ynab.py <path-to-csv-file>
+```
+
+When eksporting from Sparebanken Sør, the file will usually be called `transaksjoner.csv` and will be placed in the Downloads folder,
+so the command will usually be:
+
+```bash
+python ynab.py Downloads/transaksjoner.csv
+```
+
+A new CSV file will be created in the same folder, with `ynab-` prepended to the filename.

ynab.py

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+#!/bin/python3
+
+import sys
+import csv
+import re
+from pathlib import Path
+
+
+def usage():
+    print('Usage: ynab.py <filename>')
+
+
+def is_final(row):
+    return row[2] not in ['VISA', 'Varekjøp']
+
+
+def convert(reader, writer):
+    header = ['Date', 'Payee', 'Memo', 'Outflow', 'Inflow']
+
+    writer.writerow(header)
+
+    # Ignore header
+    reader.__next__()
+
+    for row in reader:
+        if not is_final(row):
+            continue
+
+        money_out = 0
+        money_in = 0
+
+        money = float(row[3].replace(',', '.'))
+
+        if money >= 0:
+            money_in = money
+        else:
+            money_out = -money
+
+        memo = re.match(r'="[ ]?(.+)"', row[2]).groups()[0]
+
+        new_row = [*row[:2], memo, money_out, money_in]
+        writer.writerow(new_row)
+
+
+def main():
+    if len(sys.argv) != 2:
+        usage()
+        exit(1)
+
+    filepath = Path(sys.argv[1])
+
+    new_basename = f'ynab-{filepath.name}'
+    new_filepath = filepath.parent / new_basename
+
+    with filepath.open(mode='r') as old_file:
+        reader = csv.reader(old_file, delimiter=';')
+
+        with new_filepath.open(mode='w') as new_file:
+            writer = csv.writer(new_file)
+            convert(reader, writer)
+
+
+if __name__ == '__main__':
+    main()