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python/기본

• Match

  python/기본 2024. 1. 31. 18:01

  x: int = 4 match x: case int() as e: print(f"It's int, {e}") case x if x > 1: print("It's greater than 1") case 4: print("It's four") 결과: It's int, 4 참고: type match: https://stackoverflow.com/questions/72295812/python-match-case-by-type-of-value

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• Python Enum

  python/기본 2022. 10. 21. 20:44

  import enum @enum.unique class Status(enum.Enum): Active = 1 InActive = 2 class Permission(enum.IntFlag): R = 4 W = 2 X = 1 if __name__ == '__main__': print(Status.Active.value) # 1 print(Status(2)) # Status.InActive for s in Status: print(s) print(Permission.R | Permission.W) # Permission.R|W RW = Permission.R | Permission.W print(Permission.R in RW) # True print(Permission.X in RW) # False

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• Python Closure

  python/기본 2022. 10. 21. 20:07

  코드1 from typing import Callable def sum(x: int, y: int) -> Callable[[], int]: def runner(): out = x + y print(out) return out return runner if __name__ == '__main__': f = sum(1, 2) f() 코드2 functools.partial() 을 이용해 아래처럼 작성할 수 있다. import functools def sum(x: int, y: int) -> int: out = x + y print(out) return out if __name__ == '__main__': f = functools.partial(sum, 1, 2) f() 설명 scala 의 Closure 와 ..

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• requirements.txt 자동 생성하기

  python/기본 2022. 5. 31. 16:15

  https://stackoverflow.com/a/31684470 pip install pipreqs # UnicodeDecodeError: 'cp949' codec can't decode byte 와 같은 에러가 날 경우 # --encoding=utf-8 를 추가해 준다. pipreqs --encoding=utf-8 /path/to/project

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• datetime / time

  python/기본 2022. 5. 2. 14:21

  여기서는 standard library 로 제공되는 datetime 을 사용했지만 arrow 의 사용도 고민해 볼 만하다. import datetime now = datetime.datetime.now() print(now) # 2022-05-02 14:09:29.165956 print(now.isoformat()) # 2022-05-02T14:09:29.165956 print(now.strftime('%d/%m/%y-%H%M%S%f')) # 02/05/22-140929165956 today = datetime.date.today() print(today) # 2022-05-02 print(today.strftime('%d/%m/%y')) t = datetime.time(hour=1, minute=10,..

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• tempfile / subprocess

  python/기본 2022. 5. 2. 14:04

  import tempfile # 임시 디렉토리에서 압축을 푼다든지로 응용될 수 있음 with tempfile.TemporaryFile(mode='w+') as t: t.write('hello') t.seek(0) print(t.read()) # hello with tempfile.NamedTemporaryFile(delete=False) as t: print(t.name) with open(t.name, 'w+') as f: f.write('test\n') f.seek(0) print(f.read()) with tempfile.TemporaryDirectory() as td: print(td) ##############################################################..

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• tar / zip

  python/기본 2022. 5. 2. 13:39

  import tarfile # tar.gz 파일 생성하기 with tarfile.open('test.tar.gz', 'w:gz') as tr: tr.add('test_dir') # tar.gz 파일 압축풀기 with tarfile.open('test.tar.gz', 'r:gz') as tr: tr.extractall(path='test_tar') # 특정 파일의 내용만 볼 때 with tr.extractfile('test_dir/sub_dir/sub_test.txt') as f: print(f.read()) #################################################################### import zipfile with zipfile.ZipFile('test...

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• os, pathlib, glob, shutil

  python/기본 2022. 5. 1. 21:31

  비슷하게 여러 라이브러리가 있지만 pathlib 를 추천함 import os print(os.path.exists('test.txt')) print(os.path.isfile('test.txt')) print(os.path.isdir('test.txt')) os.rename('test.txt', 'renamed.txt') os.symlink('renamed.txt', 'symlink.txt') os.mkdir('test_dir') os.rmdir('test_dir') # empty dir 일때만 삭제 가능 import pathlib pathlib.Path('empty.txt').touch() # empty file 생성 os.remove('empty.txt') ########################..

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