要求：
合并来自不同文件夹下相同csv文件，如：

三个文件夹均含有1.csv，2.csv，3.csv等等文件，现在对文件进行合并。思路：先创建一个文件名list，然后遍历。
python代码：

data = pd.read_csv(r'filename_list.csv')
base_path  = r"folder_path"
save_path = r'save_path'
folders = ['2016','2017','2018']for index, row in data.iterrows():fid = row['FID']print(fid)merged_df = pd.DataFrame()for folder in folders:folder_path = os.path.join(base_path, folder)file_path = os.path.join(folder_path,f'{fid}.csv')if os.path.exists(file_path):# print(file_path)data = pd.read_csv(file_path)merged_df = pd.concat([merged_df, data])if not merged_df.empty:merged_df.to_csv(os.path.join(save_path, f'{fid}.csv'), index=False)
print('done!')