题解 | 查字典

dict1 = {
    "a": ["apple", "abandon", "ant"],
    "b": ["banana", "bee", "become"],
    "c": ["cat", "come"],
    "d": "down",
}
alpha = input()
for i in dict1.keys():
    if alpha == i:
        if type(dict1[i]) == list:
            for j in dict1[i]:
                print(j, end = ' ')
        else:
            print(dict1[i])