如何使用python在文本文件的列组合中查找具有重复值的行

with open('filename.txt', 'r') as file:
    lines = file.readlines()

def get_key(line, columns):
    key = ''
    for column in columns:
        key += line[column] + ' '
    return key.strip()

columns = [0, 1, 2]  # 需要比较的列的索引

duplicate_rows = {}
for line in lines:
    key = get_key(line.split(), columns)
    if key in duplicate_rows:
        duplicate_rows[key].append(line)
    else:
        duplicate_rows[key] = [line]

with open('duplicate_rows.txt', 'w') as file:
    for key, rows in duplicate_rows.items():
        if len(rows) > 1:
            file.write('重复行：\n')
            for row in rows:
                file.write(row)
            file.write('\n')