Sure, here's an example code for a class in Python:

```
class ItemCatalog:
    def __init__(self):
        self.items = {}

    def add_item(self, item_id, item_name, item_description, item_price):
        self.items[item_id] = {
            'name': item_name,
            'description': item_description,
            'price': item_price
        }
    
    def remove_item(self, item_id):
        del self.items[item_id]
    
    def update_item(self, item_id, item_name=None, item_description=None, item_price=None):
        item = self.items[item_id]
        if item_name:
            item['name'] = item_name
        if item_description:
            item['description'] = item_description
        if item_price:
            item['price'] = item_price

    def search_item(self, search_string):
        matching_items = []
        for item_id, item in self.items.items():
            if search_string in item['name'] or search_string in item['description']:
                matching_items.append(item)
        return matching_items
```

This class provides a way to store a catalog of items, where each item has an ID, name, description, and price. The `add_item()` method adds a new item to the catalog, the `remove_item()` method removes an item, and the `update_item()` method updates the properties of an existing item. The `search_item()` method searches for items by keyword matching in their name or description.
Supponiamo che tu stia scrivendo un programma per un catalogo di articoli. Modella una classe per quello scopo.