Modificato in una REST API con Flask

app.py

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+import itertools
+from datetime import date
+from typing import List, Dict
+
+from dateutil import relativedelta as period
+from flask import Flask
+
+from db.access import fetch_european_departments, \
+    fetch_department_employees, \
+    fetch_american_departments, \
+    fetch_employees, \
+    fetch_departments, \
+    fetch_canadian_departments
+from models.department import Department
+
+app = Flask(__name__)
+
+
+@app.get("/")
+def index():
+    return "<h1>Homepage HR Resources</h1>"
+
+
+@app.errorhandler(404)
+@app.errorhandler(500)
+def handle_error(error):
+    return {
+        "status": error.code,
+        "description": error.description,
+        "name": error.name
+    }
+
+
+@app.get("/employee")
+def employees():
+    return {"employees": [e.to_json() for e in fetch_employees()]}
+
+
+def __employees_group_by_seniority(departments: List[Department]) -> Dict[str, dict]:
+    result = {}
+    for department in departments:
+        # Per ogni dipartimento ricerco i suoi impiegati
+        employees = fetch_department_employees(department.department_id)
+
+        # Raggruppo gli impiegati per anni di anzianità
+        employee_group_by_years = itertools.groupby(employees,
+                                                    lambda e: period.relativedelta(date.today(), e.hire_date).years)
+
+        result[department.name] = {year: [e.to_json() for e in employees]
+                                   for (year, employees) in employee_group_by_years}
+
+    return result
+
+
+@app.get("/employee/all-by-seniority")
+def employees_by_seniority():
+    departments = fetch_departments()
+    return __employees_group_by_seniority(departments)
+
+
+@app.get("/employee/american-by-seniority")
+def american_employees_by_seniority():
+    american_departments = fetch_american_departments()
+    return __employees_group_by_seniority(american_departments)
+
+
+@app.get("/employee/canadian-by-seniority")
+def canadian_employees_by_seniority():
+    canadian_departments = fetch_canadian_departments()
+    return __employees_group_by_seniority(canadian_departments)
+
+
+@app.get("/employee/european-by-seniority")
+def european_employees_by_seniority():
+    european_departments = fetch_european_departments()
+    return __employees_group_by_seniority(european_departments)