¡Hola, Mundo!

update It takes a key-value pair and puts into the existing dictionary. icecream = {'탱크보이': 1200, '폴라포': 1200, '빵빠레': 1800, '월드콘': 1500, '메로나': 1000} new_product = {'팥빙수':2700, '아맛나':1000} icecream.update(new_product) icecream >>> {'탱크보이': 1200, '폴라포': 1200, '빵빠레': 1800, '월드콘': 1500, '메로나': 1000, '팥빙수': 2700, '아맛나': 1000} islower Checks if all the characters in the text are in lower case. user_i..

datetime The module works with dates and time. x=datetime.datetime.now() x >>> datetime.datetime(2021, 5, 14, 13, 7, 18, 347271) timedelta It presents under datetime library which is generally used for calculating differences in dates and also can be used for date manipulations. from datetime import datetime, timedelta for day in range(5,0,-1): delta=timedelta(days=day) print(x-delta) >>> 2021-0..

sep Seperator, between the arguments to print() function. print('naver','kakao','samsung',sep=';') >>> naver;kakao;samsung print('naver','kakao','sk','samsung',sep='/') >>> naver/kakao/sk/samsung end= It can be put anything in end, then it will be following. '\n\ is the default. print("first",end=' ');print("second") >>> first second ; : Multiple command in one line. replace string.replace(old,n..

os Operating System, provides functionality on the Operating System such as copy the file, create the directory, etc. getcwd Get Current Working Directory, returns a string representing the current working directory. import os os.getcwd() >>> '/Users/joohyunyoon/workspace/practice/src' listdir List directory, returns a list containing the names of the entries in the directory. os.listdir() >>> [..

Open the file. 1. Open the exist file. open('file path', 'open mode') It returns the objects which has file content. The available modes are f=open('/Users/joohyunyoon/Downloads/Book2.xlsx', 'r') f >> ['\ufeffNAVER\n', 'Hyundai\n', 'LG\n', 'Kia'] A newline character (\n) is left at the end of the string, and it needed to be ommitted(using strip()). for line in lines: line = line.strip() collecti..