pet_park = {"Tom":"鱼干","Jerry":"奶酪","Buddy":"罐头","Lucky":"骨头"}
if 'Buddy' in pet_park:
    print('Buddy喜欢的食物是：' + pet_park['Buddy'])
else:
    print('Buddy 不在宠物乐园')
del pet_park['Tom']
print(pet_park)