Python Code

I have three files which are Taif.csv, Mecca.csv, and Riyadh.csv. I want to know the most common day of the week for all three cities. I did Python code for Taif city but I faced difficulty to do one code to all three cities together.

import pandas as pd filename= 'taif.csv' df=pd.read_csv(filename) df['Start Time'] = pd.to_datetime(df['Start Time']) df['day']=df['Start Time'].dt.dayofweek popular_day= df['day'].mode()[0] print('Most common day of week: ', popular_day)