How to store self values with Pickle?

Question

class Player:
    def __init__(self):
        self.money = 0
        self.level = 0
        self.xp = 0
        self.xp_until_level = 20
        self.taxi_car = "Cabbie"
        self.busines = "Нет"
        self.busines_income = 1000
        self.upgrade_cost = 10000
        self.car_speed = 10
        self.car_level = 0
        self.drives_until_new_car = 20

p = Player()

I don't know how to save self values. I making my text game and saving data is my number one problem.

Answer 1

self values are attributes of your instance. Just pickle your insntace (here p ) and it stores all the attributes:

import pickle

class Player:
    def __init__(self):
        self.money = 0
        self.level = 0
        self.xp = 0
        self.xp_until_level = 20
        self.taxi_car = "Cabbie"
        self.busines = "Нет"
        self.busines_income = 1000
        self.upgrade_cost = 10000
        self.car_speed = 10
        self.car_level = 0
        self.drives_until_new_car = 20

p = Player()

pickled = pickle.dumps(p)
new_obj = pickle.loads(pickled)
print(new_obj.taxi_car)  # Cabbie

Answer 2

Storing the class instance to a binary file:

The class instance (or any other object) can be stored to , or read from , a pickled (serialised) binary file for later use or archiving.

For example:

import pickle

# Create a class instance (as you have done).    
p = Player()

# Store the class instance to a file.
with open('./cabbie.p', 'wb') as f:  # <-- Note the 'wb' mode, for write-binary
    pickle.dump(p, f)
    
# Read the class instance from a file.
with open('./cabbie.p', 'rb') as f:  # <-- Note the 'rb' mode, for read-binary
    data = pickle.load(f)
    

Testing:

>>> vars(data)

{'money': 0,
 'level': 0,
 'xp': 0,
 'xp_until_level': 20,
 'taxi_car': 'Cabbie',
 'busines': 'Нет',
 'busines_income': 1000,
 'upgrade_cost': 10000,
 'car_speed': 10,
 'car_level': 0,
 'drives_until_new_car': 20}

Answer 3

Pickle is certainly an option. But you might also consider using ConfigParser . It's built in to the standard library, so you don't have to install another package. The advantage to ConfigParser is that you get a nice ini style file that is easily human readable. Here's some code:

import configparser

class Player:
    def __init__(self):
        self.money = 0
        self.level = 0
        self.xp = 0
        self.xp_until_level = 20
        self.taxi_car = "Cabbie"
        self.busines = "Het"
        self.busines_income = 1000
        self.upgrade_cost = 10000
        self.car_speed = 10
        self.car_level = 0
        self.drives_until_new_car = 20

        self.config=configparser.ConfigParser()

    def save_config(self):
        self.config['default'] = {}   # make blank section 'default'
        self.config['default']['money']                = f'{self.money}'
        self.config['default']['level']                = f'{self.level}'
        self.config['default']['xp']                   = f'{self.xp}'
        self.config['default']['xp_until_level']       = f'{self.xp_until_level}'
        self.config['default']['taxi_car']             = self.taxi_car
        self.config['default']['busines']              = self.busines
        self.config['default']['busines_income']       = f'{self.busines_income}'
        self.config['default']['upgrade_cost']         = f'{self.upgrade_cost}'
        self.config['default']['car_speed']            = f'{self.car_speed}'
        self.config['default']['car_level']            = f'{self.car_level}'
        self.config['default']['drives_until_new_car'] = f'{self.drives_until_new_car}'
        with open('settings.ini', 'w') as fid:
            self.config.write(fid)

    def load_config(self):
        self.config.read('settings.ini')
        self.money                = int(self.config['default']['money'])
        self.level                = int(self.config['default']['level'])
        self.xp                   = int(self.config['default']['xp'])
        self.xp_until_level       = int(self.config['default']['xp_until_level'])
        self.taxi_car             = self.config['default']['taxi_car']
        self.busines              = self.config['default']['busines']
        self.busines_income       = int(self.config['default']['busines_income'])
        self.upgrade_cost         = int(self.config['default']['upgrade_cost'])
        self.car_speed            = int(self.config['default']['car_speed'])
        self.car_level            = int(self.config['default']['car_level'])
        self.drives_until_new_car = int(self.config['default']['drives_until_new_car'])

p = Player()
p.save_config()
p.load_config()
print(dict(p.config['default']))

There is a lot of extra overhead to load/save data into variables. This is what the settings.ini file looks like:

[default]
money = 0
level = 0
xp = 0
xp_until_level = 20
taxi_car = Cabbie
busines = Het
busines_income = 1000
upgrade_cost = 10000
car_speed = 10
car_level = 0
drives_until_new_car = 20