SCHOOL RESOURCES ARCHIVE

All school related resources stored here. (maintained by Sujal Singh)

RESOURCE LIST

• 15 AUG ASSIGNMENT
• 3 SEP PRACTICAL FILE

  
  Q18) WAP to menu driven program to do the following:-
  a) Create a binary file ‘item.dat’ consisting of
  item_id, item_name, price, quantity in the following format:
  [[121,pen,20,5],[21,pencil,10,10],…..]
  b) Display the above file
  c) Add more item details in the existing file
  d) Display the details of an item for a given item_id
  

  ```python “”” Q18) WAP to menu driven program to do the following:- a) Create a binary file ‘item.dat’ consisting of item_id, item_name, price, quantity in the following format: [[121,pen,20,5],[21,pencil,10,10],…..] b) Display the above file c) Add more item details in the existing file d) Display the details of an item for a given item_id “”” import pickle

def create(): wrapper = [] while input(“Enter values (y/n):”).lower() == “y”: wrapper.append([ int(input(“Enter ITEM ID:”)), input(“Enter ITEM NAME:”), float(input(“Enter ITEM PRICE:”)), int(input(“Enter ITEM QUANTITY:”)) ])

file = open("item.dat", "wb")
pickle.dump(wrapper, file)
file.close()

def display(): try: file = open(“item.dat”, “rb”) for entry in pickle.load(file): print(f”\nITEM ID: {entry[0]}”, f”ITEM NAME: {entry[1]}”, f”ITEM PRICE: {entry[2]}”, f”ITEM QUANTITY: {entry[3]}\n”, sep=”\n”) except FileNotFoundError: print(“\nFILE DOES NOT EXIST YET! CREATE FILE FIRST\n”)

def item_append(): try: file = open(“item.dat”, “rb”) data = pickle.load(file) file.close()

    while input("Enter values (y/n):").lower() == "y":
        data.append([
            int(input("Enter ITEM ID:")),
            input("Enter ITEM NAME:"),
            float(input("Enter ITEM PRICE:")),
            int(input("Enter ITEM QUANTITY:"))
        ])

    file = open("item.dat", "wb")
    pickle.dump(data, file)
    file.close()
except FileNotFoundError:
    print("\nFILE DOES NOT EXIST YET! CREATE THE FILE FIRST\n")

def lookup(): try: file = open(“item.dat”, “rb”) item_id = int(input(“Enter ITEM ID to look for: “)) match = [] for entry in pickle.load(file): if item_id == entry[0]: match = entry break file.close()

    if match:
        print(f"\nITEM ID: {match[0]}",
              f"ITEM NAME: {match[1]}",
              f"ITEM PRICE: {match[2]}",
              f"ITEM QUANTITY: {match[3]}\n", sep="\n")
    else:
        print("\nMATCH NOT FOUND\n")
except FileNotFoundError:
    print("\nFILE DOES NOT EXIST YET! CREATE THE FILE FIRST\n")

def menu(): while True: print(“1: CREATE FILE”, “2: DISPLAY FILE”, “3: ADD MORE ITEMS”, “4: LOOKUP ITEM”, “5: EXIT”, sep=”\n”)

    choice = input("ENTER CHOICE: ")

    if choice == "1":
        create()
    elif choice == "2":
        display()
    elif choice == "3":
        item_append()
    elif choice == "4":
        lookup()
    elif choice == "5":
        break
    else:
        print("INVALID CHOICE TRY AGAIN...")

menu()

## <br>Q15) WAP to menu driven program to do the following:-<br>    (a) Create a binary file 'product.dat' in the following format<br>    {‘name’ : ‘file’, ‘price’ : 112}, {‘name’ : ‘pen’, ‘price’ : 30},etc.<br>    (b) Display the above file<br>    (c) Transfer all the records from binary file ‘product.dat’ to ‘new.dat’ whose price is less than 100.<br>
```python
"""
Q15) WAP to menu driven program to do the following:-
    (a) Create a binary file 'product.dat' in the following format
    {‘name’ : ‘file’, ‘price’ : 112}, {‘name’ : ‘pen’, ‘price’ : 30},etc.
    (b) Display the above file
    (c) Transfer all the records from binary file ‘product.dat’ to ‘new.dat’ whose price is less than 100.
"""
import pickle


def create():
    file = open("product.dat", "wb")
    while input("Enter values (y/n): ").lower() == "y":
        pickle.dump({
            "name": input("Enter name: "),
            "price": float(input("Enter price: "))
        }, file)
    file.close()


def display():
    try:
        file = open("product.dat", "rb")
        try:
            while True:
                data = pickle.load(file)
                print("\n"
                      f"NAME: {data['name']}",
                      f"PRICE: {data['price']}",
                      sep="\n"
                      )
        except EOFError:
            print("ALL RECORDS PRINTED")
        file.close()
    except FileNotFoundError:
        print("FILE DOES NOT EXIST YET, CREATE IT FIRST.")


def transfer():
    try:
        p_file, o_file = open("product.dat", "rb"), open("new.dat", "wb")
        try:
            while True:
                data = pickle.load(p_file)
                if data["price"] < 100:
                    pickle.dump(data, o_file)
        except EOFError:
            print("TRANSFER COMPLETE...")
    except FileNotFoundError:
        print("PRODUCT FILE DOESN'T EXIST YET, CREATE IT FIRST.")


def menu():
    while True:
        print("\n",
              "1: CREATE FILE",
              "2: DISPLAY FILE",
              "3: TRANSFER CHEAP PRODUCTS",
              "4: EXIT",
              "\n", sep="\n")

        choice = input("Enter choice: ")

        if choice == "1":
            create()
        elif choice == "2":
            display()
        elif choice == "3":
            transfer()
        elif choice == "4":
            break
        else:
            print("INVALID CHOICE... TRY AGAIN...")


menu()

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