如何从共享相同键的元组列表中找到平均值？

def find_average(tuples):
    # 创建一个字典来存储按键分组的元组列表
    grouped_tuples = {}

    # 将元组列表按照键进行分组
    for t in tuples:
        key = t[0]  # 假设键在元组的第一个位置
        value = t[1]  # 假设值在元组的第二个位置

        if key in grouped_tuples:
            grouped_tuples[key].append(value)
        else:
            grouped_tuples[key] = [value]

    # 计算每个键对应的平均值
    averages = {}
    for key, values in grouped_tuples.items():
        total = sum(values)
        count = len(values)
        average = total / count
        averages[key] = average

    return averages

# 示例用法
tuples = [('A', 1), ('B', 2), ('A', 3), ('B', 4)]
result = find_average(tuples)
print(result)