Objects are somethings which exists at run time, if we want to maintain its status across sessions, we need some intermediate technology such as serialization. With serialization you could flush the objects to the disk to make it persistent and deserialize it afterwards to convert it back from binary form to a runtime object.
The cases here are very simple, just 2:
- Serialization: Save an object to disk with a binary form
- Deserialization: Retrieve an object from a file
Python comes with a handy library called
pickle which tackles this situation nicely.
We need to use
pickle.dump(your_object, file, pickle.HIGHEST_PROTOCOL)
You can use the handy
with statement to write a object to the disk
with open("super.file", "wb") as f:
You should notice that the file I will write the object to is named
super.file rather than
super.txt to imply that this file will be binary based rather than plain text.
We will use
and it is as simple as
dump = pickle.load(file)
As previous, an example with
with open("super.file", "rb") as f:
pickle library under your belt, you could wrap it to make your own persistence solution in a decent manner.
Notice that this is just a simple intro to the
pickle library. There are more methods for you to explorer. The official documents can be found here: Python 2.7 or Python 3.5.