aciddust

def generate_secret_key():
  from random import choices
  from string import ascii_letters, digits
  return "".join(choices(ascii_letters + digits, k=64))
  
if __name__ == "__main__":
  generate_secret_key()

aciddust

Python Multiprocess w/ Ray

Without Ray

Each iteration takes the same amount of time.

With Ray

aciddust

apiVersion: v1
kind: ConfigMap
metadata:
  name: redis-config
data:
  redis.conf: |
    # Redis configuration file example.
    #
    # Note that in order to read the configuration file, Redis must be
    # started with the file path as first argument:

aciddust

python main.py
Enter x velocity: 62.4
Enter y velocity: 120.5

aciddust

# >>> java
export JAVA_HOME_8=$(/usr/libexec/java_home -v8)
export JAVA_HOME=$JAVA_HOME_8
# <<< java

aciddust

def get_median(arr):
    arr.sort()
    center = len(arr)//2
    return (arr[center] + arr[-center - 1]) // 2

aciddust

Call by [Value VS. Ref] in GO-lang

❯ go test ./test -bench=.
goos: darwin
goarch: amd64
pkg: promo-tables/test
cpu: VirtualApple @ 2.50GHz
BenchmarkFunctionA-10             424899              2735 ns/op
BenchmarkFunctionB-10 430348 2758 ns/op

aciddust

-- Check auto increment
SELECT
  table_name, auto_increment
FROM
  information_schema.tables
WHERE
  table_schema = 'YOUR_SCHEMA_NAME' AND auto_increment IS NOT NULL;
  
-- Alter auto increment
ALTER TABLE schema_name.table_name MODIFY id BIGINT NOT NULL AUTO_INCREMENT;

aciddust

Memory re-allocation when using dynamic array in Go w/ Python

memory reallocation (or doubling) when put element into dynamic array

동적 배열은 미리 초깃값을 작게 잡아 배열을 생성하고
데이터가 추가되어 배열이 꽉 찰 때마다, 배열의 크기를 늘려주고 값을 모두 복사하는 방식으로 구현됩니다.
이때, 배열의 크기를 늘려나가는 배율을 '그로스 팩터(Growth Factor, 성장 인자)'라고 함.
대개는 더블링(Doubling)이라 하여 그로스 팩터를 2로 한다.
(각 언어마다 늘려가는 비율은 상이하다.)

aciddust

func SubQueryRawJoin(subQuery, aliasOfSubQuery, tableName, tableNameAlias string, filters []string, joinSet map[string][][]string, orderByInfo map[string][]string) string {
	filter := "*"
	if len(filters) > 0 {
		filters = func() []string {
			var result []string
			for _, f := range filters {
				if len(strings.Split(f, ".")) < 2 {
					f = fmt.Sprintf("%s.%s", tableNameAlias, f)
				}
				result = append(result, f)