当我循环遍历字典时缺少项目

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 遍历字典的键
for key in my_dict:
    print(key)

# 遍历字典的值
for value in my_dict.values():
    print(value)

# 遍历字典的键值对
for key, value in my_dict.items():
    print(key, value)

my_dict = {}

if len(my_dict) == 0:
    print("字典为空")
else:
    for key, value in my_dict.items():
        print(key, value)