如何计算字典中的值之间的差异

def calculate_difference(dictionary):
    difference = {}
    keys = dictionary.keys()

    for key in keys:
        values = dictionary[key]
        if isinstance(values[0], (int, float)) and isinstance(values[1], (int, float)):
            diff = values[1] - values[0]
        elif isinstance(values[0], str) and isinstance(values[1], str):
            try:
                diff = float(values[1]) - float(values[0])
            except ValueError:
                continue
        else:
            continue

        difference[key] = diff

    return difference

# 示例字典
my_dict = {
    'A': ['10', '20'],
    'B': [5, 10],
    'C': ['15', '25'],
    'D': [8, 8.5]
}

result = calculate_difference(my_dict)
print(result)

{'A': 10.0, 'B': 5, 'C': 10.0, 'D': 0.5}