[PYTHON] 개념 다지기 -1

출처 : https://programmers.co.kr/learn/courses/2

출력

name = "jae yeon lee" color = "blue" print('안녕하세요. 제 이름은 {}이고 좋아하는 색상은 {}입니다.'.format(name,color ))

형변환

a=23 b=5 div=int(a/b)

list

rainbow=['빨강','주황','노랑','초록','파랑','남색','보라'] last_color = rainbow[len(rainbow)-1] print('무지개의 마지막 색은 {}이다'.format(last_color) )

list1=[1,2,3] list1.append(4) list1=[1,2,3] list2=[4,5,6] list3 = list1+list2 numbers = [1,2,3,4,5] if 5 in numbers : print("5가 있다") list1=[1,2,3] del list1[1] list = ['가위','바위','보'] for lists in list: print(lists) rainbow=["빨","주","노","초","파","남","보"] for i in range(0,len(rainbow)): color = rainbow[i] print('{}번째 색은 {}'.format(i+1,color)) rainbow=["빨","주","노","초","파","남","보"] for i,color in enumerate(rainbow): print('{}번째 색은 {}'.format(i+1,color)) days = [31,29,31,30,31,30,31,31,30,31,30,31] for i,day in enumerate(days): print('{}월의 날짜수는 {}일 입니다.'.format(i+1,day))

현재 시간 출력

import datetime print(datetime.date.today())

random

import random list = ["빨","주","노","초","파","남","보"] random_element = random.choice(list) import random random_number = random.randint(2,5) import random list = ["빨","주","노","초","파","남","보"] random.shuffle(list)

dictionary

days_in_month = {"1월":31, "2월":28, "3월":31} days_in_month["2월"]=29 days_in_month = {"1월":31, "2월":28, "3월":31,"-1월":97889789} del days_in_month["-1월"] days_in_month = {"1월":31, "2월":28, "3월":31, "4월":30, "5월":31} for day in days_in_month.keys(): print(day) days_in_month = {"1월":31, "2월":28, "3월":31, "4월":30, "5월":31} for value,key in days_in_month.items(): print("{}은 {}일이 있습니다.".format(value,key) )

dictionary & tuple

products = {"풀":800, "딱풀":1200, "색종이":1000,"색연필":5000,"스케치북":3500} catalog = {"겨울용 실내화":12000, "잠자리채":8000, "딱풀":1400} products.update(catalog) tuple1 = (11, 22, 33) for i in range( len( tuple1) ): print(tuple1[i]) tuple1 = (1,2,3) tuple2 = 1,2,3 list3 = [1,2,3] tuple3 = tuple(list3) if tuple1 == tuple2 == tuple3: print("tuple1과 tuple2와 tuple3은 모두 같습니다.")

추가

x = 3 y = 5 position = x,y a = 1 b = 2 a,b = b,a

try,except (예외처리)

try: a = 3/0 except: print("0으로 나눌 수 없습니다.") try: a = 5 b = 0 c = a / b except Exception as ex: print('다음과 같은 에러가 발생했습니다: {}'.format(ex)) shops = { "송일문방구": {"가위": 500, "크레파스": 3000}, "알파문구": {"풀": 800, "도화지": 300, "A4용지": 8000}, "다이소": {"풀": 500, "목공본드": 2000, "화분": 3000} } for shop, products in shops.items(): for product, price in products.items(): if product =='풀': print("{}: {}원".format(shop, price))