删除第一列有重复项的行，第二列只保留最近日期的行

data = [
    ['A', '2022-01-01'],
    ['B', '2022-01-02'],
    ['A', '2022-01-03'],
    ['C', '2022-01-04'],
    ['B', '2022-01-05'],
    ['A', '2022-01-06']
]

# Step 1: 遍历数据，获取每个重复项对应的最近日期
dict_dates = {}
for row in data:
    key = row[0]
    date = row[1]
    if key not in dict_dates or date > dict_dates[key]:
        dict_dates[key] = date

# Step 2: 再次遍历数据，删除重复项并保留最近日期的行
result = []
for row in data:
    key = row[0]
    date = row[1]
    if date == dict_dates[key]:
        result.append(row)

# 输出结果
for row in result:
    print(row)

['B', '2022-01-05']
['C', '2022-01-04']
['A', '2022-01-06']