Ultimate Pickle need help!

[ThePythonNoob]

I made myself a project which is to make a virtual inventory but I have been having difficulty with pickling the variable: inventory. Could someone please insert the strip of code in order to save the variable in a seperate file and make it able to import it.

import pickle
import time
def intro():
    print("\t\t\tWelcome to inventory 1.0!")
    print("\t\t   Explore the wonders of the inventory.")
intro()
class inv(object):
    amount=0
    def update():
        print("\nYou have:")
    def add(inventory):
        if invspace > len(inventory):
            print("What would you like to add?")
            inventory.append(input("Item: "))
            print("You have:")
            for item in inventory:
                print(item)
                time.sleep(0.2)
            print("\n\n")
        else:
            print("You dont have enough space!")
    def remove(inventory):
        dec=None
        rit=None
        end=int(len(inventory))
        print (end)
        if len(inventory) > 0:
            print("What item would you like to remove?")
            while dec not in range(0,end):
                try:
                    dec=int(input("Item. "))-1
                    if dec not in range(0,end):
                        if dec > 6:
                            print("You only have 8 inventory slots.")
                        else:
                            print("You dont have an item",dec+1,".")
                except ValueError:
                    print("You must type a number.")
            rit=inventory[dec]
            inventory.remove(inventory[dec])
            print("The item",rit,"has been removed.\n\n")
        else:
            print("You do not have any items in your inventory!\n\n")
    def empty(inventory):
        if len(inventory) > 0:
            print("Are you sure you would like to empty your inventory?")
            dec=None
            while not dec in ("yes","no"):
                dec=input("<yes/no>: ")
            if dec==("yes"):
                inventory=[]
                print("Your inventory has been emptied.\n\n")
                return inventory
        else:
            print("You do not have any items in your inventory!\n\n")
    def visrep(inventory):
        print(" --- --- --- ")
        print("|   |   |   |")
        print(" --- --- --- ")
        print(" --- --- --- ")
        print("|   |   |   |")
        print(" --- --- --- ")
        print(" --- --- --- ")
        print("|   |   |   |")
        print(" --- --- --- \n\n")
    def save(inventory):
        inventory=inventory
        print("Pickle here")
invspace=5
print("import pickle here")
inventory=[]
con=1
def decl():
    print("1 - Add item              |")
    print("2 - Remove item           |")
    print("3 - Empty inventory       |")
    print("4 - Visual representation |")
    print("5 - Save")
    print("6 - Quit                  |")
    print("--------------------------\n\n")
while con==1:
    print("What would you like to do?")
    decl()
    dec=None
    while not dec in range(1,7):
        try:
            dec=int(input("<1-6>: "))
            if not dec in range(1,7):
                 print("Enter a number between 1 and 6")
        except ValueError:
            print("Enter a number between 1 and 6")
    
    if dec==1:
        inv.add(inventory)
    if dec==2:
        inv.remove(inventory)
    if dec==3:
        inv.empty(inventory)
    if dec==4:
        inv.visrep(inventory)
    if dec==5:
        inv.save(inventory)
    if dec==6:
        import sys
        raise SystemExit

[woooee]

You do not have an instance of the class "inv" so the program will not run as is. Especially, see the "To create a Point" part here, which explains instantiation. You would pickle.dump and pickle.load the list "inventory". I would strongly suggest that you print it as you go along as it may or may not contain what you think. Start with the add function only, and __test__ the code by adding and printing, then add in the next function. Also, option 6=exit should change the while loop's variable and not use a SystemExit.

while con==1:
    print("What would you like to do?")
    decl()
    dec=None
    while not dec in range(1,7):
        try:
            dec=int(input("<1-6>: "))
            if not dec in range(1,7):
                 print("Enter a number between 1 and 6")
        except ValueError:
            print("Enter a number between 1 and 6")
    
    if dec==1:
        inv.add(inventory)
    if dec==2:
        inv.remove(inventory)
    if dec==3:
        inv.empty(inventory)
    if dec==4:
        inv.visrep(inventory)
    if dec==5:
        inv.save(inventory)
    if dec==6:
        con = 0
#        import sys
#        raise SystemExit