user.py

class User:

  def __init__(self, name, user_id):
    self.name = name
    self.user_id = user_id
    self.ratings = []

  def add_rating(self, rating):
    if not isinstance(rating, (int, float)):
      raise ValueError("Rating must be a number.")
    if rating < 1 or rating > 5:
      raise ValueError("Rating must be between 1 and 5.")
    self.ratings.append(rating)

  def get_average_rating(self):
    if not self.ratings:
      return 0.0
    return sum(self.ratings)/len(self.ratings)

  def __str__ (self):
    avg = self.get_average_rating()
    if avg is None:
      return f"User {self.name} (User ID: {self.user_id}) has no ratings yet."
    return f"User {self.name} (User ID: {self.user_id}) has an average rating of {avg:.1f}"