Reading and Writing CSV Data

Polymatheia supports CSV both as an input and output format.

Reading CSV data

To read records from a CSV file, use the CSVReader, passing the filename of the CSV file to load:

from import CSVReader

reader = CSVReader('filename.csv')
for record in reader:

Each row in the CSV file will become one record and each column a key within that record.

Writing CSV data

To write records to a CSV file, use the CSVWriter, passing the filename to write the CSV file to:

from import CSVWriter

records = [
        'id': 1,
        'name': 'Test Person',
        'age': 32
        'id': 2,
        'name': 'Another Test Person',
        'age': 19
        'id': 3,
        'name': 'Final Person',
        'age': 64
writer = CSVWriter('people.csv')


Records that are written to a CSV file must not contain any nested data, as demonstrated in the example above. Any reader can also be passed to write(), however the records provided by that reader must not contain any nested data.

You can use the transformation functionality to convert a nested structure into a a simple structure ready for use with write().