Pythonプログラミングの講義30日目です。
今日の講義は、標準モジュールについて。内職はAtCoder復習。
【講義内容】
- 標準モジュール
【ワンポイント】
標準モジュール
sys
import sys print(f'sys.argv: {sys.argv}') for i in range(1, len(sys.argv)): print(f'sys.argv[{i}]: {sys.argv[i]}') print(f'sys.platform: {sys.platform}')
os
import os print(f'os.environ: {os.environ}') print(f'os.sep: {os.sep}') print(f'os.altsep: {os.altsep}') print(f'os.pathsep: {os.pathsep}') print(f'os.linesep: {repr(os.linesep)}') print(f'os.path.abspath: {os.path.abspath(".")}') print(f'os.path.abspath: {os.path.abspath("test.txt")}') print(f'os.path.abspath: {os.path.abspath("test/test.txt")}') os.system('ping -4 localhost') os.system('notepad.exe') os.system('ping -4 localhost') os.startfile('explorer.exe') os.system('ping -4 localhost') os.startfile('notepad.exe') os.system('ping -4 localhost')
webbrowser
import webbrowser webbrowser.open('https://google.com')
heapq
from heapq import heappush, heappop from random import shuffle data = list(range(10)) shuffle(data) heap = [] for n in data: heappush(heap, n) print(f'HEAP: {heap}') heappush(heap, -1) print(f'HEAP: {heap}')
heapify, heapreplace
from heapq import heapify, heappop, heapreplace test = [5, 8, 0, 3, 6, 7, 9, 1, 4, 2] heapify(test) print(test) print(heappop(test)) print(test) print(heapreplace(test, -5)) print(test) print(heapreplace(test, 10)) print(test)
nlargest, nsmallest
from heapq import nlargest, nsmallest test2 = [5, 8, 0, 3, 6, 7, 9, 1, 4, 2] print(nlargest(3, test2)) print(test2) print(nsmallest(3, test2)) print(test2)
deque
- 先頭と最後の要素へのアクセスが効率的
- FIFOとして利用
from collections import deque test = [3, 8, 2, 6, 5, 7, 1, 9] dq = deque(test) print(dq) print(dq.append(5)) print(dq.appendleft(6)) print(dq.pop()) print(dq.popleft()) test = list(dq) print(test)
【今日の積み上げ】
- Pythonの基礎