比较浮点型列表的两个列表，返回第一个带有相关名称的增量

def compare_float_lists(list1, list2, target_name):
    if len(list1) != len(list2):
        return None  # 长度不同，无法比较

    for i in range(len(list1)):
        if list1[i]['name'] == target_name:
            diff = list1[i]['value'] - list2[i]['value']
            return diff

    return None  # 没有找到相关名称的元素

# 示例数据
list1 = [{'name': 'A', 'value': 1.5}, {'name': 'B', 'value': 2.3}, {'name': 'C', 'value': 3.7}]
list2 = [{'name': 'A', 'value': 1.2}, {'name': 'B', 'value': 2.1}, {'name': 'C', 'value': 3.5}]
target_name = 'B'

result = compare_float_lists(list1, list2, target_name)
if result is not None:
    print(f"The increment for {target_name} is {result}")
else:
    print(f"No element with the name {target_name} found")