<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def category_count(self):
 """Returns the number of categories in `categories`."""

        category_dict = self.categories
        count_dict = {category: len(
            category_dict[category]) for category in category_dict}
        return count_dict