Adding file name in a Column while merging multible csv files to pandas- Python

Question

I have multiple csv files in the same folder with all the same data columns,

20100104 080100;5369;5378.5;5365;5378;2368
20100104 080200;5378;5385;5377;5384.5;65         


        

Answer 1

Instead of using a list just use DataFrame's append.

df = pd.DataFrame()
for file_ in all_files:
    file_df = pd.read_csv(file_,sep=';', parse_dates=[0], infer_datetime_format=True,header=None )
    file_df['file_name'] = file_
    df = df.append(file_df)