Python 환경설정

1. conda를 설치한다
2. conda venv 셋업

   $ conda create -n venv_name
   $ conda activate venv_name
   

3. pip 설치 후 패키지 인스톨

   (exp) $ conda install -c conda-forge pip
   (exp) $ pip install package_name
   (exp) $ python --version Python 3.10.0
   

개발에는 파이참이나 이맥스를 이용한다.
이맥스 환경 설정을 정리해 보면:

1. use-package

   (exp) $ emacs --version
   GNU Emacs 26.3
   (exp) $ cat >> .emacs
   (package-initialize)
   (require 'package)
   (add-to-list 'package-archives 
        '("melpa" . "https://melpa.org/packages/") t)
   ^D
   

   이후 emacs 실행후에 다음과 같이 use-package를 설치한다.

   M-x package-refresh-contents RET
   M-x package-install RET use-package RET
   

2. elpy 설치

   (exp) $ cat >> .emacs
   (require 'use-package)
   ;; elpy
   (use-package elpy
     :ensure t
     :config
     (advice-add 'python-mode :before 'elpy-enable))
     ;; use flycheck instead of flymake
     (when (load "flycheck" t t)
   (setq elpy-modules (delq 'elpy-module-flymake elpy-modules))
   (add-hook 'elpy-mode-hook 'flycheck-mode))
   )
   ;; flycheck
   (use-package flycheck
     :ensure t
     :config
     (global-flycheck-mode t)
     ;; note that these bindings are optional
     (global-set-key (kbd "C-c n") 'flycheck-next-error)
     ;; this might override a default binding for running a python process,
     (global-set-key (kbd "C-c p") 'flycheck-previous-error)
   )
   ;; flycheck-pycheckers
   (use-package flycheck-pycheckers
     :after flycheck
     :ensure t
     :init
     (with-eval-after-load 'flycheck
   (add-hook 'flycheck-mode-hook #'flycheck-pycheckers-setup))
     (setq flycheck-pycheckers-checkers
   '(mypy3 pyflakes))
   )
   ^D
   

3. M-x python-mode 실행하면 아래와 같이 Elpy가 활성화 됨.
   
   M-x elpy-config로 설정을 확인하고 해당 화면에서 flake8을 설치한다.

   Elpy Configuration
   Emacs.............: 26.3
   Elpy..............: 1.35.0
   Virtualenv........: None
   Interactive Python: python3 3.10.0 (/home/merona/miniconda3/envs/exp/bin/python3)
   RPC virtualenv....: rpc-venv (/home/merona/.emacs.d/elpy/rpc-venv)
   Python...........: python 3.8.10 (/home/merona/.emacs.d/elpy/rpc-venv/bin/python)
   Jedi.............: 0.18.0
   Autopep8.........: 1.6.0
   Yapf.............: 0.31.0
   Black............: 21.10b0
   Syntax checker....: Not found (flake8)
   

   뭔가 꼬여서 잘 안되면 M-x elpy-rpc-reinstall-virtualenv 로 가상환경을 다시 셋업한다.

• 참조: https://gist.github.com/cwyang/e4683a491fd525e9270fb36bf44ca5a4

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