What Is the __pycache__ Folder in Python?
When you develop a self-contained Python script, you might not notice anything unusual about your directory structure. However, as soon as your project becomes more complex, you’ll often decide to extract parts of the functionality into additional modules or packages. That’s when you may start to see a __pycache__ folder appearing out of nowhere next to your source files in seemingly random places:
project/
│
├── mathematics/
│ │
│ ├── __pycache__/
│ │
│ ├── arithmetic/
│ │ ├── __init__.py
│ │ ├── add.py
│ │ └── sub.py
│ │
│ ├── geometry/
│ │ │
│ │ ├── __pycache__/
│ │ │
│ │ ├── __init__.py
│ │ └── shapes.py
│ │