Matplotlib_13.py

#new revenue column 
df['revenue'] = df.apply(lambda x: x.checkout_price*x.num_orders,axis=1) 

#new month column 
df['month'] = df['week'].apply(lambda x: x//4) 

#list to store month-wise revenue 
month=[] 
month_order=[] 

for i in range(max(df['month'])):
    month.append(i) 
    month_order.append(df[df['month']==i].revenue.sum()) 
    
#list to store week-wise revenue 
week=[] 
week_order=[] 

for i in range(max(df['week'])): 
    week.append(i) 
    week_order.append(df[df['week']==i].revenue.sum())