Python 3 Script to Build Grocery List and Calculate Budget and Bill of Items & Products Full Project For Beginners



# This loop will go on until the budget is integer or float
while True:
        bg = float(input("Enter your budget : "))
        # if budget is integer or float it will be stored
        # temporarily in variable 's'
        s = bg
    except ValueError:
        print("PRINT NUMBER AS A AMOUNT")

# dictionary to store product("name"), quantity("quant"),
# price("price") with empty list as their values
a ={"name":[], "quant":[], "price":[]}

# converting dictionary to list for further updation
b = list(a.values())

# variable na value of "name" from dictionary 'a'
na = b[0]

# variable qu value of "quant" from dictionary 'a'
qu = b[1]

# variable pr value of "price" from dictionary 'a'
pr = b[2]

# This loop terminates when user select 2.EXIT option when asked
# in try it will ask user for an option as an integer (1 or 2)
# if correct then proceed else continue asking options
while True:
        ch = int(input("1.ADD\n2.EXIT\nEnter your choice : "))
    except ValueError:
        print("\nERROR: Choose only digits from the given option")
        # check the budget is greater than zero and option selected
        # by user is 1 i.e. to add an item
        if ch == 1 and s>0:  

            # input products name               
            pn = input("Enter product name : ")
            # input quantity of product
            q = input("Enter quantity : ")
            # input price of the product
            p = float(input("Enter price of the product : "))

            if p>s:
                # checks if price is less than budget
                print("\nCAN, T BUT THE PRODUCT")

                # checks if product name already in list
                if pn in na:
                    # find the index of that product
                    ind = na.index(pn)

                    # remove quantity from "quant" index of the product

                    # remove price from "price" index of the product

                    # insert new value given by user earlier
                    qu.insert(ind, q)

                    # insert new value given by user earlier
                    pr.insert(ind, p)

                    # subtracting the price from the budget and assign
                    # it to 's' sum(pr) is because pr = [100, 200] if
                    # budget is 500 then s = bg-sum(pr) = 200
                    # after updating for same product at index 0 let
                    # pr = [200, 200] so s = 100
                    s = bg-sum(pr)

                    print("\namount left", s)
                    # append value of in "name", "quantity", "price"

                    # as na = b[0] it will append all the value in the
                    # list eg: "name":["rice"]

                    # same for quantity and price

                    # after appending new value the sum in price
                    # as to be calculated
                    s = bg-sum(pr)

                    print("\namount left", s)

        # if budget goes zero print "NO BUDGET"
        elif s<= 0:
            print("\nNO BUDGET")

# will print amount left in variable 's'
print("\nAmount left : Rs.", s)

# if the amount left equals to any amount in price list
if s in pr:
    # then printing the name of the product which can buy
    print("\nAmount left can buy you a", na[pr.index(s)])

print("\n\n\nGROCERY LIST")

# print final grocery list
for i in range(len(na)):
    print(na[i], qu[i], pr[i])

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