import os# Function to display the main menudef display$\_$menu$()$: print$("$Store XYZ Inventory Management System"$)$ print$("1.$ Add an Item to the Inventory."$)$ print$("2.$ Remove an Item from the Inventory."$)$ print$("3.$ Update an Item's Information."$)$ print$("4.$ Display a specific Items Information."$)$ print$("5.$ Exit"$)$# Function to add an item to the inventorydef add$\_$item$()$: # Function to validate ID def validate$\_$id$($id$)$: if len$($id$)!=8$ or id$[3]!=\text{'}-\text{'}$ or not id$[$:$3].$isalpha$()$ or not id$[4$:$].$isdigit$()$: return False return True # Function to validate name def validate$\_$name$($name$)$: # Add your validation code here if len$($name$)<1$: return False return True # Function to validate category def validate$\_$category$($category$)$: # Add your validation code here if len$($category$)<1$: return False return True # Function to validate quantity def validate$\_$quantity$($quantity$)$: # Add your validation code here try: quantity $=$ int$($quantity$)$ if quantity $<=0$: return False except ValueError: return False return True # Function to validate unit price def validate$\_$unit$\_$price$($price$)$: # Add your validation code here try: price $=$ float$($price$)$ if price $<=0$: return False except ValueError: return False return True # Function to validate supplier email def validate$\_$supplier$\_$email$($email$)$: # Add your validation code here if $"$@$"$ not in email or $"."$ not in email: return False return True # Function to validate item details def validate$\_$details$($details$)$: # Add your validation code here if len$($details$)<1$: return False return True # Collect item information from the user id $=$ input$("$Enter the ID of the item $($format: XYZ$-1234)$:$")$ if not validate$\_$id$($id$)$: print$("$Invalid ID format."$)$ return name $=$ input$("$Enter the name of the item: $")$ if not validate$\_$name$($name$)$: print$("$Invalid name."$)$ return category $=$ input$("$Enter the category of the item: $")$ if not validate$\_$category$($category$)$: print$("$Invalid category."$)$ return quantity $=$ input$("$Enter the quantity of the item: $")$ if not validate$\_$quantity$($quantity$)$: print$("$Invalid quantity."$)$ return unit$\_$price $=$ input$("$Enter the unit price of the item: $")$ if not validate$\_$unit$\_$price$($unit$\_$price$)$: print$("$Invalid unit price."$)$ return supplier$\_$email $=$ input$("$Enter the supplier email of the item: $")$ if not validate$\_$supplier$\_$email$($supplier$\_$email$)$: print$("$Invalid supplier email."$)$ return details $=[]$ while True: detail $=$ input$("$Enter a detail for the item $($press Enter to finish$)$: $")$ if detail $==""$: break if not validate$\_$details$($detail$)$: print$("$Invalid detail."$)$ continue details.append$($detail$)$ # Add item to the inventory file with open$("$inventory$.$txt$","$a$")$ as file: file.write$($f$"\{$id$\},\{$name$\},\{$category$\},\{$quantity$\},\{$unit$\_$price$\},\{$supplier$\_$email$\},\{\text{'},\text{'}.$join$($details$)\}$

$")$ print$("$Item added successfully."$)$# Function to remove an item from the inventorydef remove$\_$item$()$: # Collect item ID from the user id $=$ input$("$Enter the ID of the item to remove: $")$ # Check if item exists in inventory file items $=[]$ with open$("$inventory$.$txt$","$r$")$ as file: for line in file: if line.strip$().$split$(",")[0]==$ id: items.append$($line$.$strip$())$ if not items: print$("$Item not found."$)$ return print$("$Item found with the following information:"$)$ for item in items: print$($item$)$ confirm $=$ input$("$Are you sure you want to remove this item? $($yes$/$no$)$: $")$ if confirm.lower$()==$ "yes": with open$("$inventory$.$txt$","$w$")$ as file: for item in items: if item.strip$().$split$(",")[0]!=$ id: file.write$($f$"\{$item$\}$

$")$ print$("$Item removed successfully."$)$ else: print$("$Removal cancelled."$)$# Function to update an item's informationdef update$\_$item$()$: # Collect item ID from the user id $=$ input$("$Enter the ID of the item to update: $")$ # Check if item exists in inventory file items $=[]$ with open$("$inventory$.$txt$","$r$")$ as file: for line in file: if line.strip$().$split$(",")[0]==$ id: items.append$($line$.$strip$())$ if not items: print$("$Item not found."$)$ return print$("$Item found with the following information:"$)$ for item in items: print$($item$)$ # Display update menu print$("$

Update Menu:"$)$ print$("1.$ Update Name"$)$ print$("2.$ Update Category"$)$ print$("3.$ Update Quantity"$)$ print$("4.$ Update Unit Price"$)$ print$("5.$ Update Supplier Email"$)$ print$("6.$ Update Item Details"$)$ # Collect user choice choice $=$ input$("$Enter your choice: $")$ if choice $==\text{'}1\text{'}$: new$\_$name $=$ input$("$Enter the new name: $")$ items$[0]=$ items$[0].$split$(",",1)[0]+","+$ new$\_$name $+","+$ items$[0].$split$(",",2)[2]$ elif choice $==\text{'}2\text{'}$: new$\_$category $=$ input$("$Enter the new category: $")$ items$[0]=$ items$[0].$split$(",",1)[0]+","+$ items$[0].$split$(",",1)[1].$split$(",",1)[0]+","+$ new$\_$category $+","+$ items$[0].$split$(",",2)[2]$ elif choice $==\text{'}3\text{'}$: new$\_$quantity $=$ input$("$Enter the new quantity: $")$ items$[0]=$ items$[0].$split$(",",3)[0]+","+$ new$\_$quantity $+","+$ items$[0].$split$(",",4)[3]$ elif choice $==\text{'}4\text{'}$: new$\_$price $=$ input$("$Enter the new unit price: $")$ items$[0]=$ items$[0].$split$(",",4)[0]+","+$ new$\_$price $+","+$ items$[0].$split$(",",5)[4]$ elif choice $==\text{'}5\text{'}$: new$\_$email $=$ input$("$Enter the new supplier email: $")$ items$[0]=$ items$[0].$rsplit$(",",1)[0]+","+$ new$\_$email elif choice $==\text{'}6\text{'}$: new$\_$details $=[]$ while True: detail $=$ input$("$Enter a new detail for the item $($press Enter to finish$)$: $")$ if detail $==""$: break new$\_$details.append$($detail$)$ items$[0]=$ items$[0].$split$(",",6)[0]+","+$ items$[0].$split$(",",7)[0]+","+",".$join$($new$\_$details$)$ else: print$("$Invalid choice."$)$ return with open$("$inventory$.$txt$","$w$")$ as file: for item in items: file.write$($f$"\{$item$\}$

$")$ print$("$Item information updated successfully."$)$# Function to display item informationdef display$\_$item$\_$info$()$: # Display submenu print$("$Display Menu:"$)$ print$("1.$ Display all items information."$)$ print$("2.$ Display all items information sorted by Quantity."$)$ print$("3.$ Display a specific items information based on the ID$.")$ # Collect user choice choice $=$ input$("$Enter your choice: $")$ if choice $==\text{'}1\text{'}$: with open$("$inventory$.$txt$","$r$")$ as file: for line in file: print$($line$.$strip$())$ elif choice $==\text{'}2\text{'}$: sort$\_$order $=$ input$("$Sort by Quantity $($a $-$ ascending, d $-$ descending$)$: $")$ with open$("$inventory$.$txt$","$r$")$ as file: lines $=$ file.readlines$()$ lines.sort$($key$=$lambda x: int$($x$.$strip$().$split$(",")[3]),$ reverse$=($sort$\_$order.lower$()==\text{'}$d$\text{'}))$ for line in lines: print$($line$.$strip$())$ elif choice $==\text{'}3\text{'}$: id $=$ input$("$Enter the ID of the item: $")$ with open$("$inventory$.$txt$","$r$")$ as file: for line in file: if line.strip$().$split$(",")[0]==$ id: print$($line$.$strip$())$ return print$("$Item not found."$)$ else: print$("$Invalid choice."$)$# Main functiondef main$()$: while True: display$\_$menu$()$ choice $=$ input$("$Enter your choice $(1-5)$: $")$ if choice $==\text{'}1\text{'}$: add$\_$item$()$ elif choice $==\text{'}2\text{'}$: remove$\_$item$()$ elif choice $==\text{'}3\text{'}$: update$\_$item$()$ elif choice $==\text{'}4\text{'}$: display$\_$item$\_$info$()$ elif choice $==\text{'}5\text{'}$: print$("$Exiting program..."$)$ break else: print$("$Invalid choice. Please enter a number between $1$ and $5.")$# Entry point of the programif $\_\_$name$\_\_=="\_\_$main$\_\_"$: main$()$