써니 노트 써니 노트

Passing Functions as Arguments

•A function is a namedset of instructions that performs a specific task. •A function can take one or more parameters (arguments) and returnsa value. •First mechanism for abstraction and decomposition •Advantage of using function : - Facilitates code reuse - Helps avoiding repetitive code - Hides implementation details - Makes testing easier parameters : - You can specify a default valuefor one o..

문제 : Implement a function that copies the contents of a file to a new file. The function should add a header (one line of arbitrary text) to the top def copy_file(src, dest, header): with open (src, 'r') as f_in , open (dest, 'w') as f_out: f_out.write(header) for line in f_in.readlines: f_out.write(line)

create file # opening a file in write mode will either create a new file (if the file does not exist) # or overwrite an existing one f = open('test.txt', 'w') read file f = open('test.txt', 'r') contents = f.read() # read the entire file content print(contents) contents = f.read(10) # read only the first 10 characters of the file print(contents) line = f.readline() # read first line of the file ..

문제 : Assign a random value to a variable and ask the user to guess the value. If the guess is lower than the chosen value, print ‘too low’, if it is greater, print ‘too high’. In case the number is correct, ‘correct’ and terminate the program. take home: random library와 while True / break 구문을 활용한 infinite loop 작성하기 import random rnd = random.randint (0, 100) while True: guess = int input("guess ..

아래의 값들은 파이썬에서 False로 취급되고, 그외의 값들은 모두 True로 취급된다 ! False # a boolean expression None # None type 0, 0L, 0.0, 0j “”, (), [] # empty sequences {} # empty mapping [[]] # caution ==> this is not a empty sequence :) so this is True

생각보다 유용한 하지만 잘 안쓴는 isinstance method ! x = [1,2,3] 이라할때 타입을 알고싶을때 type(x) == list 와 같은 조건문을 사용하는 대신 isinstance(x,list)와 같이 작성할수있다. 모든것이 object인 파이썬에서 x는 리스트 객체의 instance로 볼 수 있기 때문 :))

생각보다 쓰일일이없어서 검색하지않고서는 기억이 안날수있는 문법중에하나인 input function과 헷갈리는 string interpolation ! 문제 : Ask from the user the following information: name, age, occupation and print the following message using the provided values: Hi NAME! I see you are AGE years old and work as a OCCUPATION. # ask and store what the user has typed in a variable name = input('What is your name?') age = input('How old are you?')..