All notes, in reading order - Page 16

Shallow and Deep Copy

Assignment shares, a shallow copy duplicates one level, and a deep copy duplicates everything. Choosing the wrong one is one of the most common source...

Python

Reference Counting and Garbage Collection

Python frees an object the moment nothing refers to it. A second collector exists solely to find reference cycles, which counting alone can never recl...

Python

Bytecode and the Execution Model

Compilation, the code object, the stack machine and the frame. A closer look at what the interpreter is actually doing while your program runs.

Python

Threading

Threads let a program wait for several slow things at once. In Python they help with input and output, and cannot speed up pure computation.

Python

Multiprocessing

Processes each run their own interpreter with their own GIL, so they can use every processor core. The cost is that nothing is shared by default.

Python

async and await

Asynchronous code runs many waiting tasks in one thread. A coroutine pauses at await, the event loop runs something else, and thousands of tasks becom...

Python

The GIL: What It Is and Why It Exists

CPython allows only one thread to execute bytecode at a time. That single lock explains why threads help with waiting and never with computation.

Python

Regular Expression Fundamentals

A pattern describes a shape of text. Character classes say what, quantifiers say how many, anchors say where, and groups say which part to keep.

Python

The re Module

Seven functions cover every regex job: search, match, fullmatch, findall, finditer, sub and split. Knowing which one to reach for is most of the skill...

Python