如何在字典中插入重复的值？

my_dict = {}

# 添加第一个值
key = "key1"
value = "value1"
if key in my_dict:
    my_dict[key].append(value)
else:
    my_dict[key] = [value]

# 添加第二个值
key = "key1"
value = "value2"
if key in my_dict:
    my_dict[key].append(value)
else:
    my_dict[key] = [value]

print(my_dict)

{'key1': ['value1', 'value2']}