Python嵌套字典"None“在完成迭代后出现

my_dict = {
    "key1": "value1",
    "key2": None,
    "key3": "value3"
}

for key, value in my_dict.items():
    if value is None:
        continue
    print(f"Key: {key}, Value: {value}")

def process_nested_dict(dictionary):
    for key, value in dictionary.items():
        if isinstance(value, dict):
            process_nested_dict(value)
        elif value is not None:
            print(f"Key: {key}, Value: {value}")

my_dict = {
    "key1": {
        "nested_key1": "nested_value1",
        "nested_key2": None,
        "nested_key3": "nested_value3"
    },
    "key2": "value2",
    "key3": None
}

process_nested_dict(my_dict)