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Python Intermediate

What is Pickle?

Python's built-in module for serializing and deserializing Python objects into a byte stream for storage or transmission.

Pickle converts Python objects (lists, dictionaries, classes, machine learning models) to bytes and back. Usage: pickle.dump(obj, file) to save, pickle.load(file) to restore. It handles complex object graphs including circular references.

Security warning: Never unpickle data from untrusted sources — it can execute arbitrary code. For safe serialization, use JSON (simple types), MessagePack, or Protocol Buffers. Pickle is useful for caching, ML model storage, and inter-process communication.

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The Abstract Base Classes module that enables defining interfaces and abstract methods that subclasses must implement.
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Optional annotations that indicate the expected types of variables, function parameters, and return values.
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A data validation library that uses Python type annotations to validate and serialize data with automatic error reporting.
Python Metaclass
A class whose instances are classes themselves — the class of a class that controls how classes are created and behaved.
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A standard library module providing type hints for function signatures and variables, enabling static analysis without runtime enforcement.
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A formatted string literal prefixed with f that allows embedding Python expressions directly inside curly braces.
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