I'm trying to make a simple library where the user can add and remove books from his shopping cart, but I don't know how to use if statements with OOP and classes.
try:
class library:
def __init__(self, books, customer):
self.books = books
self.customer = customer
# sign:
check = input("manager account(1), customer account(2): ")
if check == "2":
#age >= 18
age = int(input("enter your age: "))
if age >= 18:
#name
name = input("enter your firstname: ")
# ID
import random
x = "ID"+str(random.randint(101,999))
print(f"your ID is: {x}")
print("you should memorize it")
y = input("enter password that has at list 8 caracterse: ")
# Password
while len(y) < 8:
y = input("enter password that has at list 8 caracterse: ")
print(f"your password is: {y}")
print("you should memorize it")
data = [x,y]
choice_1 = input("check your shopping cart(1): \nadd books to your shopping cart(2): \nremove books from your shopping cart(3): ")
if choice_1 == "1":
def __str__(self):
return f"customer {self.customer} bought those books{self.books}"
elif choice_1 == "2":
def __iadd__(self, other):
self.books.append(other)
return self
order = library(["the golsen company"],"Mr.asad")
print(order.books)
order += input("enter a book: ")
print(order.books)
except ValueError as ages:
print(ages)
I don't know if this is the right way to use the if statement with classes so if you can just give me an example to show how it's done correctly?
OK, I have rewritten your code to implement it in a more organized way. Your class "library" was not really a library at all; it is a class for "orders", and I have renamed it as such. I didn't know what you wanted for the manager account, so the manager account just assigns a fake user name without requiring a signup. I also fixed the spelling errors and the tabbing.
import random
import sys
class Order:
def __init__(self, books, customer):
self.books = books
self.customer = customer
def __iadd__(self, other):
self.books.append(other)
return self
def __isub__(self, other):
self.books.remove(other)
return self
def __str__(self):
return f"custumer {self.customer} bought those books {self.books}"
# sign in.
check = input("manager account(1),custumer account(2): ")
if check == '1':
x = 'manager'
if check == "2":
#age >= 18
age = int(input("enter your age: "))
if age < 18:
print("Sorry, you must be at least 18.")
sys.exit(0)
#name
name = input("enter your firstname: ")
# ID
x = "ID"+str(random.randint(101,999))
print(f"your ID is: {x}")
print("you should memorize it")
# Password
y = input("enter password that has at least 8 characters: ")
while len(y) < 8:
y = input("enter password that has at least 8 characters: ")
print(f"your password is: {y}")
print("you should memorize it")
# Main menu.
order = Order( [], x )
while True:
print('---')
choice_1 = input("1. check your shopping cart\n2. add books to your shopping cart\n3. remove books from your shopping cart\n4. quit: ")
if choice_1 == "1":
print( order )
elif choice_1 == "2":
order += input("enter a book: ")
elif choice_1 == "3":
book = input("enter a book: ")
if book in order.books:
order -= book
else:
print( f"{book} is not in your cart." )
elif choice_1 == "4":
break
when you said "fonction", I think you mean "function". When you make a try: block, you must also add an except: block. Also, don't put code directly in the class. Put it inside a function (a.k.a methods). I put the code starting from # sign in the __int__ method. We generally don't put methods (functions) inside other methods. So, put the __str__ and __iadd__ methods outside the __init__ method. To call it, use self.__str__() and self.__iadd__().
Here is the updated code:
try:
class library:
def __init__(self, books, customer):
self.books = books
self.customer = customer
# sign:
check = input("manager account(1), customer account(2): ")
if check == "2":
# age >= 18
age = int(input("enter your age: "))
if age >= 18:
# name
name = input("enter your firstname: ")
# ID
import random
x = "ID" + str(random.randint(101, 999))
print(f"your ID is: {x}")
print("you should memorize it")
y = input("enter password that has at list 8 caracterse: ")
# Password
while len(y) < 8:
y = input("enter password that has at list 8 caracterse: ")
print(f"your password is: {y}")
print("you should memorize it")
data = [x, y]
choice_1 = input("check your shopping cart(1): \nadd books to your shopping cart(2): ")
if choice_1 == "1":
self.__str__()
elif choice_1 == "2":
self.__iadd__()
# age < 18
elif age < 18:
print("this library is not for your age")
def __iadd__(self, other):
self.books.append(other)
return self
def __str__(self):
return f"customer {self.customer} bought those books{self.books}"
except:
pass
order = library(["the golsen company"], "Mr.asad")
print(order.books)
order += input("enter a book: ")
print(order.books)
Related
if you choose to return a book at the start of the program, without checking out any books,
then it won't allow the return (intended). So say the user wants to check out 5/10 copies of
book1. It checks them out and subtracts them from the copies on shelf. They choose to return
3 one day, and 2 another day. (For testing purposes) the day after that, they return another
copy of book1, which is more than they checked out. It appends it to the book1.borrow aka
num of copies. It should not allow the user to return more copies than the original numbr of copies. So this is what I have in my main module. I can add the class LibraryBook if
needed.
from LibraryBook import *
book1 = LibraryBook()
book1.title = "not set"
book1.year = "no se"
book1.author = "set not"
book1.borrow = 10
book2 = LibraryBook()
book2.title = "tes ton"
book2.year = "es on"
book2.author = "ton tes"
book2.borrow = 8
selection = 0
amount = 0
amount1 = 0
while selection != 5:
print("Select an option")
print('1 - Borrow a book')
print('2 - Return a book')
print('3 - See info on available books')
print('4 - Exit')
print()
selection = int(input("What would you like to do? "))
print()
if selection == 1:
print("Book 1 is: ", book1.title)
print("Book 2 is: ", book2.title)
print()
bookNum = int(input("Enter the book number. "))
print()
if bookNum == 1:
print()
amount = int(input("Enter the number of copies you would like to check out. "))
print()
if (amount <= book1.borrow) and (amount > 0):
book1.borrowed(amount)
else:
print("We only have", book1.borrow, "copies available.")
print()
elif bookNum == 2:
print()
amount = int(input("Enter the number of copies you would like to check out. "))
print()
if (amount <= book2.borrow) and (amount > 0):
book2.borrowed(amount)
else:
print("We only have", book2.borrow, "copies available.")
print()
else:
print()
print("That book is not here. Enter 1 or 2. ")
print()
if selection == 2:
print("Book 1 is: ", book1.title)
print("Book 2 is: ", book2.title)
print()
bookNum = int(input("Which book would you like to return? "))
print()
if bookNum == 1:
print()
amount1 = int(input("Enter the amount of copies you would like to return. "))
print()
if amount1 <= amount:
book1.returned(amount1)
print()
elif book1.borrow == book1.borrow:
print("Invalid number of copies. Count the books and try again ")
print()
else:
print("You only checked out", amount)
print()
elif bookNum == 2:
print()
amount1 = int(input("Enter the amount of copies you would like to return. "))
print()
if amount1 <= amount:
book2.returned(amount1)
print()
elif book2.borrow == book2.borrow:
print("You did not check out this book.")
print()
else:
print("You only checked out", amount)
print()
else:
print("Invalid selection. Choose book 1 or book 2.")
print()
if selection == 3:
print()
print("Book 1:")
print(book1.__str__())
print()
print("Book 2:")
print(book2.__str__())
print()
if (selection <= 0) or (selection >= 5):
print("Invalid selection. Enter a number 1-4. ")
print()
if selection == 4:
break
I'm not the best programmer but I think I made and example here
Ofc is not the best I made it larger for you to understand, there are some bugs like when asked for book if u give bigger then 2 will break but I let you fix it ;D
import sys, os, time, re
class LibraryBook(object):
def __init__(self, title, year, author, borrow):
self.title = title
self.year = year
self.author = author
self.borrow = borrow
def borrow_add(self, amount: int):
self.borrow += amount
def left(self):
return self.borrow
def get_title(self):
return self.title
def borrow_sell(self, amount: int):
self.borrow -= amount
def get_book_info(self):
val = f'''
Book Title: {self.title}
Book Year: {self.year}
Book Author: {self.author}
Left in stock: {self.borrow}
'''
return val
book1 = LibraryBook('Prison Break', 2016, 'My House', 8)
book2 = LibraryBook('Hello', 1999, 'NO one', 10)
###########
#That is so you can do book3,4,5 etc.. without write in print all books on hand ;D
books = re.findall('book.', (str(globals().copy())).replace("'", ''))
books_titles = [eval(f'{o}.get_title()') for o in books]
##########
user_lib =[]
#You can use that in a function (def) and call it when you need it
while True:
os.system('cls')
option = int(input('''
Select an option
1 - Borrow a book
2 - Return a book
3 - See info on available books
4 - See my lib
5 - Exit
>>> '''))
if option == 1:
option_2 = input("\n".join(f"Book{o+1}:{i}" for o, i in enumerate(books_titles))+'\nWhat book(ex: 1):')
option_3 = int(input('How much?: '))
if int(eval(f'book{option_2}.left()'))-option_3 >= 0:
if x:=list(filter(lambda book: book['name'] == eval(f'book{option_2}.title'), user_lib)):
user_lib[user_lib.index(x[0])]['amount'] +=option_3
else:
user_lib.append({'name': eval(f'book{option_2}.get_title()'), 'amount': option_3})
print(f'You borrowed {option_3} books')
eval(f'book{option_2}.borrow_sell({option_3})') #Remove from store
else:
print(f'We have {eval(f"book{option_2}.left()")} books left...')
time.sleep(1) # wait 1 second for user to read then reset
elif option == 2:
option_2 = input("\n".join(f"Book{o+1}:{i}" for o, i in enumerate(books_titles))+'\nWhat book(ex: 1):')
if len(x:=list(filter(lambda book: book['name'] == eval(f'book{option_2}.get_title()'), user_lib))) > 0:
option_3 = int(input('How much?: '))
if user_lib[pos:=user_lib.index(x[0])]['amount'] -option_3 >= 0:
user_lib[pos]['amount'] -= option_3
if user_lib[pos]['amount'] == 0:
user_lib.pop(pos)
print(f'You returned {option_3} books')
eval(f'book{option_2}.borrow_add({option_3})') # Add them back to shop
else:
print(f"You don't have enogh books, you have only: {x[0]['amount']}")
time.sleep(1) # wait 1 second for user to read then reset
else:
print("You don't any books of thta kind")
time.sleep(1)
elif option == 3:
option_2 = input("\n".join(f"Book{o+1}:{i}" for o, i in enumerate(books_titles))+'\nWhat book(ex: 1):')
print(eval(f'book{option_2}.get_book_info()'))
input('Press enter to continue...')
elif option == 4:
print("\n".join(f"Book Name:{user_lib[o]['name']}\nAmount I have:{user_lib[o]['amount']}" for o, i in enumerate(user_lib)) if user_lib != [] else "You don't have any books")
elif option == 5:
sys.exit(1)
else:
print('Invalid number')
time.sleep(1) # wait 1 second for user to read then reset
New to programming and trying to learn how to store data using pickle. Essentially, what I'm trying to do is create an address book using classes stored in a dictionary. I define the class (Contact). It all worked, but when I tried to introduce pickling to store data from a previous session, I've created 2 errors that I've found so far.
1: If I select to load a previous address book, I cant update or view the class variables. It's almost like there are two different dictionaries.
2: I select not to load a previous address book and add a contact. When I add the contact and try to view the contacts, I'll get an "Unbound Error: local variable 'address book' referenced before assignment"
What am I doing wrong with pickling?
address_book= {}
class Contact:
def __init__(self,first_name,last_name, phone,company):
self.first_name = first_name
self.last_name = last_name
self.phone = phone
self.company = company
def __call__(self):
print("Contact: %s \nPhone #: %s \nCompany: %s" %(self.name,self.phone,self.company))
def erase(entry):
del address_book[entry] # delete address book entry
del entry #delete class instance
def save():
new_file = open("addressBook.pkl", "wb")
saved_address = pickle.dump(address_book, new_file)
new_file.close()
def load():
open_file = open("addressBook.pkl", "rb")
address_book = pickle.load(open_file)
open_file.close()
print(address_book)
return address_book
def add_contact():
first_name = input("Please type the first name of the contact. ")
last_name = input("Please type in the last name of the contact. ")
if " " in first_name or " " in last_name:
print("Please do not add spaces to your first or last name.")
else:
phone = input("Please type the user phone number without hyphens. ")
if not phone.isnumeric():
print("That isn't a valid phone number.")
else:
company = input("Please type the company they work for. ")
contact = Contact(first_name,last_name,phone,company)
address_book[first_name + " " +last_name] = contact #assign key[first and last name] to value[the class instance] in dictionary
def view_contact(entry):
if entry in address_book:
print("First Name: %s" %(address_book[entry].first_name)) #get class variables
print("Last Name: %s" %(address_book[entry].last_name))
print("Phone Number: %s" %(address_book[entry].phone))
print("Company: %s" %(address_book[entry].company))
else:
print("That person isn't in your address book")
def update(entry):
if entry in address_book:
update_choice = input("Would you like to update the first name (f), last name (l), phone (p), or company (c)? ").lower()
if update_choice == "f":
address_book[entry].first_name = input("Please type the updated first name of this contact. ")
updated_key = address_book[entry].first_name + " " + address_book[entry].last_name
address_book[updated_key] = address_book[entry]
del address_book[entry] #delete old key
elif update_choice == "l": #update last name
address_book[entry].last_name = input("Please type the updated last name of this contact. ")
updated_key = address_book[entry].first_name + " " + address_book[entry].last_name
address_book[updated_key] = address_book[entry]
del address_book[entry]
elif update_choice == "p":
address_book[entry].phone = input("Please type the updated phone number of this contact. ")
elif update_choice == "c":
address_book[entry].company = input("Please type the updated company of this contact. ")
else:
print("That was not valid. Please try again.")
def main():
print("Welcome to your address book!!")
returning_user = input("Would you like to load a previous address book? Y or N ").lower()
if returning_user == "y":
address_book = load()
while True:
choice = input("Please type A:Add, B:View All Contacts, V:View a Contact, D:Delete, U:Update, or X:Exit ").lower()
if choice == "x":
break
elif choice == "a":
add_contact()
elif choice == "b":
if len(address_book) == 0: #error check if no contacts
print("You don't have any friends. PLease go make some and try again later. :(")
else:
for i in address_book:
print(i)
elif choice == "v":
if len(address_book) == 0:
print("You don't have any friends. PLease go make some and try again later. :(")
else:
view = input("Who do you want to view? Please type in their first and last name. ")
view_contact(view)
elif choice == "d":
if len(address_book) == 0:
print("You don't have any friends. PLease go make some and try again later. :(")
else:
contact = input("Please type the first and last name of the person you want to delete ")
if contact in address_book:
erase(contact)
elif choice == "u":
if len(address_book) == 0:
print ("C'mon, you don't know anyone yet. How about you make some friends first?")
else:
choice = input("What is the first and last name of the person you'd like to update? ")
update(choice)
else:
print("That was not valid. Please try again.")
print()
save_book = input("Would you like to save your book? Y or N ").lower()
if save_book == "y":
save()
print("Thanks for using the address book!")
main()
Here is my code the lists are where Im having issues. Im new to python and I do not understand how 2D-lists work but I need to add then in to the program for a grade. Any help will be appreciated.
#Define Vars
import locale
locale.setlocale( locale.LC_ALL, '')
order_total = 0.0
price = 3.5
fmt_price = locale.currency(price, grouping=True)
qty = int(0)
#cookie list
cookie_list = list()
cookie_list = "Savannah Thin-Mints Tag-a-longs Peanut-Butter Sandwich".split()
order_list = list()
#cookie choices
def disp_items():
print("Please choose one of our flavours. Enter the item number to choose")
for c in range(len(cookie_list)):
print("{}. \t{}".format(c+1, cookie_list[c]))
print()
#Menu Choices
def disp_menu():
choice_list = ["a", "d", "m", "q"]
while True:
print("\nWhat would you like to do?")
print("a = add an item")
print("d = delete an item")
print("m = display the meal so far")
print("q = quit")
choice = input("\nmake a selection: ")
if choice in choice_list:
return choice
else:
print("I dont't understand that entry. Please Try again.")
# Math Function**********************
def calc_tot(qty):
#this function is qty * price
return qty * 3.5
def disp_order():
print("\nGirl Scout Cookie Order for", cust)
print()
print("Itm\tName\tQty\tPrice")
print("---\t----\t----\t----")
order_total_items = 0 #accumulator
order_price = 0
for c in range(len(order_list)):
detail_list = [" ", 0]
detail_list.append(order_list)
print("{}.\t{}\t{}\t{}".format(c+1, order_list[c][0], order_list[c][1], price))
order_total_items += order_list[c][1]
order_price += price
print("\nYour Order Contains {} items for total of {} \n".format(order_total_items, order_price))
print("-" * 30)
#ADD Process
def add_process():
valid_data = False
while not valid_data:
disp_items()
try:
item = int(input("Enter item number: "))
if 1 <= item <= len(cookie_list):
valid_data = True
else:
print("\nThat was not a vaild choice, please try again.")
except Exception as detail:
print("error: ", detail)
#Valid Qty
valid_data = False
while not valid_data:
try:
qty = int(input("Enter Quantity: "))
if 1 <= qty <= 10:
valid_data = True
else:
print("\nThat was not a valid quantity, please try again.")
except Exception as detail:
print("Error; ", detail)
print("Please try again")
#Function call for multiplication
item_total = calc_tot(qty)
fmt_total = locale.currency(item_total, grouping=True)
#User Choice
print("\nYou choose: {} boxes of {} for a total of {}".format(qty,
cookie_list[item-1],
fmt_total))
print()
#verify inclusion of this item
valid_data = False
while not valid_data:
incl = input("Would you like to add this to your order? (y/n): ")
print()
if incl.lower() =="y":
#2-D List
inx = item - 1
detail_list = [inx, qty]
order_list.append(detail_list)
valid_data = True
print("{} was added to your order".format(cookie_list[inx]))
elif incl.lower() == "n":
print("{} was not added to your order".format(cookie_list[inx]))
valid_data = True
else:
print("That was not a vaild response, please try again")
#Delete function
def del_item():
if len(order_list) == 0:
print("\n** You have no items in your order to delete **\n")
else:
print("\nDelete an Item")
disp_order()
valid_data = False
while not valid_data:
try:
choice = int(input("Please enter the item number you would like to delete: "))
if 1<= choice <= len(order_list):
choice = choice - 1
print("\nItem {}. {} with {} boxes will be deleted".format(choice +1,
order_list[choice][0],
order_list[choice][1]))
del order_list[choice]
valid_data = True
except Exception as detail:
print("Error: ", detail)
print("Please try again")
#Main program
# Banner
print("Welcome to the Girl Scout Cookie")
print("Order Program")
cust = input("Please enter your name: ")
while True:
choice = disp_menu()
if choice == "a":
add_process()
elif choice == "d":
del_item()
elif choice == "q":
break
disp_order()
disp_order()
print("Thank you for your order")
Here's the output
Girl Scout Cookie Order for *****
Itm Name Qty Price
--- ---- ---- ----
1. **0** 1 3.5
2. **0** 1 3.5
3. **4** 5 3.5
Your Order Contains 7 items for total of 10.5
Under name there should be a name of a girl Scout Cookie and not the index number, how do i fix this?
Many Thanks.
When you print the order in disp_order() you should print from cookie_list[c] in the second column. And print the whole item instead off just the first letter.
print("{}.\t{}\t{}\t{}".format(c+1, cookie_list[c], order_list[c][1], price))
The cookie names are not of equal length, so you'll have to adjust for that.
I am getting this invalid syntax for if selection == 1: under def mainmenu(): Do not understand why I am getting this error. Please help me figure this out. I completely doesnt make any sense to me why its there.
contacts = {}
class person:
def ___init__(self,first,last,number):
self.first = first
self.last = last
self.number = number
def get_info(self):
print(first,last,number)
class friend(person):
def __init__(self,email,bday):
self.email = email
self.bday = bday
def get_info_friend(self):
super().get_info()
print(email,bday)
def add_a_contact():
choice = int(input("Contact type: \n\t 2: Person \nEnter an option here:"))
first = input("Enter the first name:")
last = input("Enter the last name:")
number = input("Enther the number:")
if choice == 1:
email = input("Email Address is:")
bday = input("Their bday is:")
return Friend(email,bday,first,last,number)
return person(first,last,number)
def add_contact_to_dict():
contact = add_a_contact()
contacts[contact.last_name] = contact
def lookup():
last = input("What is their last name?:")
if last in contacts:
contact = contacts[last]
print("Name&number: ", contact.first,contact.last,contact.number)
if type(friend) is friend:
print("Email and Bday is: ", contact.email,contact.bday)
def mainmenu():
selection = 0
temp = ""
while selection != 3:
print("Select an option: \n\t 1: Add \n\t 2: Lookup \n\t 3: Exit")
selection = int(input("Enter an option:")
if selection == 1:
temp = add_contact_to_dict()
elif selection == 2:
lookup()
elif selection == 3:
pass
else:
print("Not a valid option")
if __name__ == "__mainmenu__":
mainmenu()
So when you are asked for the input under selection, you need another bracket to for the "int" part. Hopefully, that should solve your issue.
I am working on this homework assignment and I am stuck on what I know to be a very simple problem. The premise of the code is a petty cash system in which the user can make deposits, withdraws, and get their current balance.
My problem is that the withdraws and deposits don't seem to be going through my Account class. Is it a global variable issue? I'll be adding timestamps later. Thank you in advance.
import datetime
import time
class Account:
def __init__(self, initial):
self.balance = initial
def deposit(self, amt):
self.balance = self.balance + amt
def withdraw(self,amt):
self.balance = self.balance - amt
def getbalance(self):
return self.balance
def yesno(prompt):
ans = raw_input(prompt)
return (ans[0]=='y' or ans[0]=='Y')
def run():
done = 0
while not done:
user_options()
print
done = not yesno("Do another? ")
print
def user_options():
print ("Here are your options:")
print
print (" (a) Deposit cash")
print (" (b) Withdraw cash")
print (" (c) Print Balance")
print
u = raw_input("Please select a letter option: ").lower()
user_input(u)
def user_input(choice):
account = Account(0.00)
if choice == "a" or choice == "b" or choice == "c":
if choice == "a":
d = input("Enter Deposit Amount: $")
account.deposit(d)
if choice == "b":
w = input ("Enter Withdraw Amount: $")
account.withdraw(w)
if choice == "c":
print ("Balance Amount: $"),
print account.getbalance()
else:
print ("Not a correct option")
run()
#now = datetime.datetime.now()
Python Version: 2.7.2
The problem is:
account = Account(0.00)
Every time user_input is called, you create a new, empty account. Since user_input is called from user_options which is called inside the while loop in run, this happens before every transaction.
You need to move that line out of the loop, for example:
def run():
done = 0
global account # just showing you one way, not recommending this
account = Account(0.00)
while not done:
user_options()
print
done = not yesno("Do another? ")
print
You don't need global variables, just restructure the code slightly like this
def run():
account = Account(0.00)
done = 0
while not done:
user_option = user_options()
user_input(user_option, account)
print
done = not yesno("Do another? ")
print
def user_options():
print ("Here are your options:")
print
print (" (a) Deposit cash")
print (" (b) Withdraw cash")
print (" (c) Print Balance")
print
return raw_input("Please select a letter option: ").lower()
def user_input(choice, account):
if choice == "a" or choice == "b" or choice == "c":
if choice == "a":
d = input("Enter Deposit Amount: $")
account.deposit(d)
if choice == "b":
w = input ("Enter Withdraw Amount: $")
account.withdraw(w)
if choice == "c":
print ("Balance Amount: $"),
print account.getbalance()
else:
print ("Not a correct option")
run()
You can still do more to make the code nicer, this is just enough to get the account part working