CODE EXAMPLE FOR PYTHON

how to make a bill in python

tprice = 0
tup = [['apple','100','2'],['blackberry','100','23']]
f= open(filename,'w')
g= open('recpt.txt','r')
lines = g.readlines()
for line in lines:
    base = line.split()
    tup.append(base)
print('S.no','	','Product','	','Unit','	','Price')
for i in range(len(tup)):
    if len(tup[i][0]) <= 7:
      print([i+1],'	',tup[i][0],'	','	',tup[i][2],'	',tup[i][1])
    else:
        print([i+1], '	', tup[i][0], '	', tup[i][2],'	',tup[i][1])
    price = int(tup[i][1])
    tprice += price
print(tprice)