在嵌套字典中将多个相同的键合并为一个键

def merge_duplicate_keys(nested_dict):
    merged_dict = {}
    for key, value in nested_dict.items():
        if key in merged_dict:
            merged_dict[key].append(value)
        else:
            merged_dict[key] = [value]
    return merged_dict

nested_dict = {
    'key1': 'value1',
    'key2': 'value2',
    'key3': 'value3',
    'key1': 'value4',
    'key2': 'value5'
}

merged_dict = merge_duplicate_keys(nested_dict)

{
    'key1': ['value1', 'value4'],
    'key2': ['value2', 'value5'],
    'key3': ['value3']
}