Pyrmanent
A base class to make your Python classes permanent in a flash.
Features
- Easy to use.
- Great compatibility.
- No database needed.
- Ask for new features through the issues section.
- Join our Telegram group for support or development.
Installation
You can install or upgrade the module with:
pip install pyrmanent --upgrade
Usage guide
Basic usage:
Making your custom clases permanent is as easy as adding Pyrmanent as the base class.
from pyrmanent import Pyrmanent
class MyClass(Pyrmanent):
pass
Call the save method to save the current instance data:
my_class_instance = MyClass()
my_class_instance.my_data = "Hello world!"
my_class_instance.save()
To load a previously saved instance data, just create the instance and data will be automatically loaded:
my_class_instance = MyClass()
print(my_class_instance.my_data)
"Hello world!"
Configuration
Instance name
The name parameter allows saving different instances of the same class. Each one will keep its own data.
first_instance = MyClass(name="first")
first_instance.my_data = "This is the first instance"
first_instance.save()
second_instance = MyClass(name="second")
second_instance.my_data = "And this the second one"
second_instance.save()
Saving path
The path for the saved files can be customized with the folder parameter. If not provided, the files will be saved on the execution folder.
my_class_instance = MyClass(folder="data")
Auto saving
The autosave parameter allows using the autosave method to save data only when True. This is specially useful for your custom class methods.
class MyClass(Pyrmanent):
def set_title(self, title):
self.title = title
self.autosave()
# The instance data will be saved when the method is called
my_class_instance = MyClass(autosave=True)
my_class_instance.set_title("Test")
# You should manually save the instance data
my_class_instance = MyClass(autosave=False)
my_class_instance.set_title("Test")
my_class_instance.save()
Instance initialization
Override the __init__ method
The __init__ method can be overrided to provide default configurations, like for example the saving path in below example.
class MyClass(Pyrmanent):
def __init__(self, name, autosave=True):
super().__init__(name=name, folder="data", autosave=autosave)
The init method
On the other hand, you can define the init method (without the underscores) to initialize attribute values. This method is called before saving the instance data for the first time.
class MyClass(Pyrmanent):
def init(self):
self.first_value = 1
self.second_value = 2
Use dill instead of pickle
Dill extends the compatibility with several data types that pickle module can't serialize. It provides the same interface, so it's totally compatible without any code change needed. To start using dill, just install it using pip and it will be used by default:
pip install dill --upgrade
To stop using dill, just uninstall it. You can find more information about dill in the official repo.
License
Copyright © 2021 Sergio Abad. See license for details.
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