Python

General

Check environment
- Reference: Python, pip, site-packages (Chinese)
```
$ pip -V
$ python -m site
```

Style

Style Guide

Tools

$ flake8 path/to/code/to/check.py
# or
$ flake8 path/to/code/

Poetry

Initialization

$ poetry new my-repo

This will create a project ./my-repo/. For existing project, do:

$ cd pre-existing-project
$ poetry init

Dependencies

$ poetry add numpy

Virtual ENV

$ poetry run python your_script.py
$ poetry run pytest

# or
$ poetry shell

Publish

Config PyPI token
Publish
```
$ poetry build
$ poetry publish
```

Change version number

# Print version number
$ poetry version
$ poetry version -s

# Bump version number
$ poetry version patch
$ poetry version minor
$ poetry version major
$ poetry version [patch | minor | major | prepatch | preminor | premajor | prerelease]

Conda

Conda User Guide

Installation

Install Package

$ conda install xxx
$ conda install -c conda-forge xxx

Useful Tools

$ conda install -c conda-forge tmux

Post-installation

$ conda config --set auto_activate_base false
# It creates ~/.condarc with following content:
    auto_activate_base: false

Jupyter notebook

$ conda install ipykernel
$ python -m ipykernel install --user --name lal --display-name "python-lal"
# It modifies ~/Library/Jupyter/kernels/  or  ~/.local/share/jupyter/kernels/

Conda ENV

$ conda create -n py37 python=3.7
$ conda activate py37
$ conda deactivate 
$ conda env list
$ conda env remove -n py37

HTTP server

Star a http server (e.g., for file sharing)

$ python3 -m http.server

Virtual Environment

virtualenv

$ virtualenv <myenv>
$ source myenv/bin/activate
$ deactivate

pip

$ pip freeze > requirements.txt
$ pip install -r requirements.txt