If the data look like:
Store,Dept,Date,Weekly_Sales,IsHoliday 1,1,2010-02-05,24924.5,FALSE 1,1,2010-02-12,46039.49,TRUE 1,1,2010-02-19,41595.55,FALSE 1,1,201
df = df_try for i in range(4): df = df.append(df_try) # Here, we have df_try times 5 df = df.append(df) # Here, we have df_try times 10