mess-with-python

Study path

• ChatGPT Explained Completely. (2023)
• The Hitchhiker's Guide to Python!
• Interpreter versions
  • How can I install multiple versions of Python on latest OS X and use them in parallel? (2020)
  • pyenv/pyenv: Simple Python version management
• Using Python Environments in Visual Studio Code
  • venv — Creation of virtual environments
    • If this project is dead, just tell us (2019)
    • poetry
  • Conda
    • Anaconda or Miniconda?
    • Miniconda
• The Long Story of How Neural Nets Got to Where They Are: A Conversation with Terry Sejnowski (2023)
  • Gradient descent
  • Hopfield network
  • Boltzmann machine
  • Simulated annealing
  • Backpropagation
  • Control theory
  • Knowledge distillation
• PyPI · The Python Package Index
• Python (programming language)
  • Interpreters
    • CPython
      • GlobalInterpreterLock
    • PyPy
      • Tracing just-in-time compilation
    • Stackless Python
      • Microthread
    • MicroPython
    • CircuitPython
    • IronPython
      • Dynamic Language Runtime
    • Jython
  • Dialects
    • Cython
      • Using in IPython/Jupyter notebook
    • RPython
    • Mojo
      • Why Mojo🔥
• Project Jupyter
  • IPython
  • Matplotlib
  • NumPy
    • Numba
  • pandas
  • The Scientific Paper Is Obsolete. Here's What's Next. - The Atlantic (2018) (archive)
    • Jupyter, Mathematica, and the Future of the Research Paper (2018)
  • mwouts/jupytext
• Doing Data Science in Visual Studio Code
• What's New in Python
• The History of Python (all posts)
  • Introduction and Overview (2009)
  • PEP 20 – The Zen of Python (2004)

Prerequisites

• macOS 12 or so
• Install Xcode or Command Line Tools
• Install Homebrew
• Install VS Code
  • Python extension
  • Jupyter extension

Interpreters

One interpreter

• brew install python
• python3

Many interpreters

• brew install python@3.11
• brew install python@3.10
• brew install pypy3.9
• python3.11
• python3.10
• pypy3.9

Then in VS Code:

• ⇧⌘P >Python: Select Interpreter
  • Refresh, then add if not found

Alternative: Pyenv

• brew install pyenv

In your shell profile:

if [ -x "$(which pyenv)" ]; then
  eval "$(pyenv init --path --no-rehash zsh)")"
fi

• pyenv install --list
• pyenv install 3.11.4
• pyenv local 3.11.4
• pyenv rehash
• pip3
• python3

Virtual environments

venv

• python3.10 -m venv myvenv
• source myvenv/bin/activate
• which python3
• python3 --version
• deactivate
• rm -r myvenv

Or in VS Code:

• ⇧⌘P >Python: Create Environment…

Don't commit a virtual environment.

Alternative: poetry

• brew install poetry
• poetry new foo

Packages

• pip install beep-boop-test
• pip freeze > requirements.txt

To recall them later:

• pip install -r requirements.txt

To upgrade:

• pip list --outdated
• pip install --upgrade beep-boop-test
• (Freeze again)

Jupyter

• pip install jupyter
• jupyter notebook
• ipython
• pip install jupyterlab
• jupyter lab

VS Code

• Open the project folder
• Open a .py file
• ⇧⌘P >Python: Select Interpreter or >Python: Create Environment…
• ⇧↩︎ = ⇧⌘P Python: Run Selection/Line in Python Terminal
  • REPL-driven development?
• Python › Analysis settings
  • Enable Auto Import Completions
  • Set Type Checking Mode to basic
• Make a debug launcher
• Open an .ipynb file
  • >Notebook: …
• ⇧⌘P >Jupyter: Create Interactive Window

Conda

Install:

• brew install conda
• brew install conda-zsh-completion
• conda init zsh # or whatever shell
• Start a new tab

Use it:

• ⇧⌘P >Python: Create Environment…
• conda activate `pwd`/.conda
• conda install jupyter
• which jupyter
• conda env export > environment.yml
• conda deactivate
• rm -r .conda
• ⇧⌘P >Python: Create Environment…
• conda activate example
• which jupyter

To remove Conda:

• conda init --reverse zsh
• brew uninstall conda conda-zsh-completion