I need help ！please tell me why !

#My python code

product_list =[("iphone,5800"),
               ("Mac pro,9800"),
               ("coffee,58"),
               ("Ibook,50"),
               ("watch,10800"),
               ("bike,800"),
               ]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            print(index,item)
        user_choice = input("Which to buy ?")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary:
                    shopping_list.append(p_item)
                    salary -=p_item[1]
                    print("Added %s into your shopping cart,your current balance is %s"% (p_item,salary))
                else:
                    print("your balance is only [%s] "%salary)
            else:
                print("product code [%s] is not exist"%user_choice)
        elif user_choice =='q':
            print("----------------shopping  list----------------" )
            for p in shopping_list:
                print(p)
            print("your current balance :",salary)
            exit()
        else:
            print("invild option")

#Author:Brill

product_list = [
    ("Iphone,5800"),
    ("Mac Pro,9800"),
    ("Bike,800"),
    ("Watch,10600"),
    ("Coffee,31"),
    ("IBook,58"),
]
shopping_list = []
salary = input ("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item  in  enumerate(product_list):
            print(index,item)
        user_chose = input ("which to buy :")
        if user_chose.isdigit():
            user_chose = int(user_chose)
            if user_chose < len(product_list) and user_chose >= 0:
                p_item = product_list[user_chose]
                if p_item[1] <= salary:
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\0331m]"%(p_item,salary))
                else:
                    print("\033[41;1m Your pocketmoney is no enough !")
            else:
                print("product code [%s] is not exist ! "% user_chose)
        elif user_chose =="q":
            print("---------------shopping list-----------------")
            for p in shopping_list:
                print(p)
            print("Your current balance :",salary)
        else:
            print("invalid option")


#Reference standrand python code:

product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            #print(product_list.index(item),item)
            print(index,item)
        user_choice = input("选择要买嘛？>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary: #买的起
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary) )
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m" % salary)
            else:
                print("product code [%s] is not exist!"% user_choice)
        elif user_choice == 'q':
            print("--------shopping list------")
            for p in shopping_list:
                print(p)
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")

product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            #print(product_list.index(item),item)
            print(index,item)
        user_choice = input("选择要买嘛？>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary: #买的起
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary) )
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m" % salary)
            else:
                print("product code [%s] is not exist!"% user_choice)
        elif user_choice == 'q':
            print("--------shopping list------")
            for p in shopping_list:
                print(p)
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")