What is pickling and unpickling?

Pickling and unpickling are processes used in programming to convert objects into a byte stream and vice versa.

1. Pickling:

   • Pickling is the process of converting a Python object into a byte stream. This byte stream can be stored in a file or transferred over a network.
   • To pickle an object, you need to import the pickle module in Python.
   • Use the pickle.dump() function to convert the object into a byte stream and save it to a file or send it over a network.

2. Unpickling:

   • Unpickling is the process of converting a byte stream back into a Python object.
   • To unpickle a byte stream, you need to import the pickle module in Python.
   • Use the pickle.load() function to read the byte stream from a file or receive it over a network and convert it back into a Python object.

Pickling and unpickling are commonly used for various purposes, such as:

• Saving and loading complex data structures, like lists, dictionaries, and objects.
• Sending data between different programs or systems.
• Caching and memoization, where you can store the results of expensive computations and retrieve them later without recomputing.

It is important to note that pickling and unpickling should be used with caution, as unpickling data from an untrusted source can potentially lead to security vulnerabilities.