如何在字典长度/顺序变化时从字典列表中拉取特定值

def binary_search(dictionaries, target):
    left = 0
    right = len(dictionaries) - 1

    while left <= right:
        mid = (left + right) // 2
        if dictionaries[mid]['key'] == target:
            return dictionaries[mid]
        elif dictionaries[mid]['key'] < target:
            left = mid + 1
        else:
            right = mid - 1

    # 如果没有找到目标值，可以返回一个默认值或者抛出一个异常
    return None

# 示例字典列表
dictionaries = [
    {'key': 'apple', 'value': '苹果'},
    {'key': 'banana', 'value': '香蕉'},
    {'key': 'orange', 'value': '橙子'},
    {'key': 'pear', 'value': '梨子'},
    {'key': 'watermelon', 'value': '西瓜'}
]

# 对字典列表按照key进行排序
sorted_dictionaries = sorted(dictionaries, key=lambda x: x['key'])

# 从排序后的字典列表中查找特定值
target_key = 'orange'
result = binary_search(sorted_dictionaries, target_key)

if result:
    print(f"找到了键为'{target_key}'的字典：{result}")
else:
    print(f"没有找到键为'{target_key}'的字典")