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nput: Array of elements ["h","o","l","a"] Output: String with comma delimited elements of the array in th same order. "h,o,l,a" solution: def print_array(arr): return ','.join(map(str, arr))

You were camping with your friends far away from home, but when it's time to go back, you realize that your fuel is running out and the nearest pump is 50 miles away! You know that on average, your car runs on about 25 miles per gallon. There are 2 gallons left. Considering these factors, write a function that tells you if it is possible to get to the pump or not. Function should return true if ..

We want an array, but not just any old array, an array with contents! Write a function that produces an array with the numbers 0 to N-1 in it. For example, the following code will result in an array containing the numbers 0 to 4: arr(5) // => [0,1,2,3,4] Note: The parameter is optional. So you have to give it a default value. Solution: def arr(n: int = 0): return [i for i in range(n)]

ZoneInfo 을 사용하면 기존 pytz를 사용하지 않고도 타임존을 사용할 수 있다! (*ZoneInfo 는 Python3.9 버전 이상부터 사용가능) 'ZoneInfo' vs 'pytz' 그렇다면 ZoneInfo 와 pytz 는 어떤 차이가 있을까? 우선 ZoneInfo 는 따로 설치할 필요가 없는 빌트인 클래스이므로 다음처럼 간단하게 불러올 수 있다. from zoneinfo import ZoneInfo ZoneInfo 와 pytz 를 각각 사용해 현재시간을 가져와보자. pytztz = timezone("Asia/Seoul") zonetz = ZoneInfo("Asia/Seoul") print(datetime.datetime.now(tz=pytztz).tzname()) print(datetime.d..

BaseSettings을 사용한 객체를 lru_cache 할 때, TypeError: unhashable type: 에러가 발생할 때가 있다. 정리하면 다음과 같은 상황이다. given FastAPI 에서 lru_cache로 반환하는 BaseSettings 객체를, when 다시 lru_cache를 사용하는 함수가 인수로 받을 때, then TypeError: unhashable type: 에러가 발생함. e.g class Config(BaseSettings): URL: str = Field(..., env="URL") class Config: env_file = "secrets/.env" env_file_encoding = "utf-8" @lru_cache def get_config() -> Confi..

pytest 에서 async 테스트 함수를 실행하는 방법에는 'strict 모드' 와 'auto 모드' 가 있다. 오늘은 손쉽게 비동기 테스트를 할 수 있는 'auto 모드' 에 대해 알아보자. 먼저 pytest-asyncio 를 설치한다. pip install pytest-asyncio 아래 1번과 2번 중에 하나를 선택하여 파일과 코드를 추가한다. 1번 # pytest.ini [pytest] asyncio_mode = auto 2번 # pyproject.toml [tool.pytest.ini_options] asyncio_mode = "auto" 이것으로 'auto 모드' 설정이 끝났다. auto 모드는 pytest.ini 혹은 pyproject.toml 파일에 옵션 코드를 추가하여 async 테스트..

The cockroach is one of the fastest insects. Write a function which takes its speed in km per hour and returns it in cm per second, rounded down to the integer (= floored). For example: 1.08 --> 30 Note! The input is a Real number (actual type is language dependent) and is >= 0. The result should be an Integer. Solution: def cockroach_speed(s): import math return math.floor(km_to_cm(s) / hour_to..

Exclusive "or" (xor) Logical Operator Overview In some scripting languages like PHP, there exists a logical operator (e.g. &&, ||, and, or, etc.) called the "Exclusive Or" (hence the name of this Kata). The exclusive or evaluates two booleans. It then returns true if exactly one of the two expressions are true, false otherwise. For example: false xor false == false // since both are false true x..

Create a function that takes 2 integers in form of a string as an input, and outputs the sum (also as a string): Example: (Input1, Input2 -->Output) "4", "5" --> "9" "34", "5" --> "39" "", "" --> "0" "2", "" --> "2" "-5", "3" --> "-2" Notes: If either input is an empty string, consider it as zero. Inputs and the expected output will never exceed the signed 32-bit integer limit (2^31 - 1) Solutio..

No Loops Allowed You will be given an array a and a value x. All you need to do is check whether the provided array contains the value, without using a loop. Array can contain numbers or strings. x can be either. Return true if the array contains the value, false if not. With strings you will need to account for case. Looking for more, loop-restrained fun? Check out the other kata in the series:..