如何对重复的项键进行分组

def group_duplicates(data):
    grouped_data = {}
    for key, value in data:
        if key in grouped_data:
            grouped_data[key].append(value)
        else:
            grouped_data[key] = [value]
    return grouped_data

# 示例数据
data = [("A", 1), ("B", 2), ("A", 3), ("C", 4), ("B", 5)]

# 对重复的项键进行分组
result = group_duplicates(data)

# 打印分组后的结果
for key, values in result.items():
    print(key, values)

A [1, 3]
B [2, 5]
C [4]