Import struttura base del progetto

main.py

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+import itertools
+from datetime import date
+
+from dateutil import relativedelta as datedelta
+
+from db.access import fetch_european_departments, fetch_department_employees
+
+if __name__ == '__main__':
+    # Ricerco tutti i dipartimenti europei
+    for department in fetch_european_departments():
+        print(f"\n####### Department of {department.name} #######\n")
+        # Per ogni dipartimento ricerco i suoi impiegati
+        employees = [employee for employee in fetch_department_employees(department.department_id)]
+        for employee in employees:
+            print(f"{employee.last_name} {employee.first_name}")
+
+        print("\n")
+        # Raggruppo gli impiegati per anni di anzianità
+        calculate_seniority = lambda e: datedelta.relativedelta(date.today(), e.hire_date).years
+        employee_group_by_years = itertools.groupby(employees, calculate_seniority)
+        # Stampo i risultati dell'aggregazione
+        for years_to_employees in employee_group_by_years:
+            print(f"Employees with {years_to_employees[0]} years of seniority:")
+            for employee in years_to_employees[1]:
+                print(employee.last_name, employee.first_name)
+            print("\n")