dictionary_07.py

fruits_dict: dict = dict()

citrusfruit: set = {"oranges", "lemons", "limes", "satsumas", "nectarines"}
treefruit: set = {"apples", "pears", "cherries", "plums", "peaches", "plums",
                  "cherries", "oranges", "lemons", "limes"}
stonefruit: set = {"cherries", "plums", "peaches", "nectarines"}

for fruit in citrusfruit.union(stonefruit).union(treefruit):
    fruits_dict.setdefault(fruit, [])

for key, value in fruits_dict.items():
    if key in citrusfruit:
        value.append("citrusfruit")
    if key in treefruit:
        value.append("treefruit")
    if key in stonefruit:
        value.append("stonefruit")

print(fruits_dict)