import csv
import os


base_folder_path = os.getcwd()

list_path = os.path.join(base_folder_path, "list")

# ディレクトリ名と絶対パスの対応を格納する辞書を初期化
path_dict = {}

# 指定したディレクトリ内のディレクトリのリストを取得し、辞書に追加
for item in os.listdir(list_path):
    full_path = os.path.join(list_path, item)
    if os.path.isdir(full_path):
        path_dict[item] = full_path


# 新しいCSVファイルのパス
output_csv_path = "./output.csv"

# csvの読み込みと書き込み
with open("./data_list.csv", "r", encoding="utf-8-sig") as read_file, open(
    output_csv_path, "w", encoding="utf-8-sig", newline=""
) as write_file:

    reader = csv.reader(read_file, delimiter=",")
    writer = csv.writer(write_file, delimiter=",")

    for row in reader:
        directory_name = row[0].strip()
        if directory_name in path_dict:
            directory_path = path_dict[directory_name]
            row.append(directory_path)  # 対応するディレクトリのパスを追加
        writer.writerow(row)  # 書きこみ

修正後↓

import csv
import os
import argparse


def main() -> None:

    parser = argparse.ArgumentParser()
    parser.add_argument("-l", "--list_path", default="./list")
    parser.add_argument("-i", "--input_path", default="./data_list.csv")
    parser.add_argument("-o", "--output_path", default="./output.csv")
    args = parser.parse_args()

    list_path = args.list_path
    input_csv_path = args.input_path
    output_csv_path = args.output_path

    # ディレクトリ名と絶対パスの対応を格納する辞書を初期化
    path_dict = {}

    # 指定したディレクトリ内のディレクトリのリストを取得し、辞書に追加
    for item in os.listdir(list_path):
        full_path = os.path.join(list_path, item)
        if os.path.isdir(full_path):
            path_dict[item] = full_path

    itemlist_with_added_path = []

    # csvの読み込み
    with open(input_csv_path, "r", encoding="utf-8-sig") as read_file:
        reader = csv.reader(read_file, delimiter=",")

        for data in reader:
            directory_name = data[0].strip()
            if directory_name in path_dict:
                directory_path = path_dict[directory_name]
                data.append(directory_path)  # 対応するディレクトリのパスを追加
            itemlist_with_added_path.append(data)

    with open(output_csv_path, "w", encoding="utf-8-sig", newline="") as write_file:
        writer = csv.writer(write_file, delimiter=",")

        for data in itemlist_with_added_path:
            writer.writerow(data)  # 書きこみ


if __name__ == "__main__":
    main()

追加↓

from openpyxl import Workbook


output_data = {"hoge1": [["1", "a"], ["2", "b"]], "hoge2": [["3", "c"], ["4", "d"]]}

wb = Workbook()
ws = wb.active

row = 0
for path, error_data_list in output_data.items():
    for error_data in error_data_list:
        for column, data in enumerate([path] + error_data):
            ws.cell(row + 1, column + 1, data)
        row += 1


wb.save("sample.xlsx")