I extracted the following information :
- File layout
- The number of municipalities
- The number of municipalities with the Ligne_5 attribute
- The department which has the most communes
- The municipalities in the Aisne department
And added a column to the data containing the commune's department number.
The result is available in the CSV file "commune_et_departement.csv", with columns Code_commune_INSEE, Nom_commune, Code_postal, and department, ordered by postal code.