STEEM POWER retention ratio of top 50 witnesses

by joviansummer original STEEMIT post: https://steemit.com/blog/@joviansummer/steem-power-retention-ratio-of-top-50-witnesses Hello, this is @joviansummer(witness: @jswit). Some time ago there was a bit of discussion on discord witness chanel about witnesses' power-down/cashing-out. So out of curiosity I just checked current ratio of witnesses' own STEEM POWER(VESTS) and all-time producer reward(VESTS). The ratio is calculated by the following simple formula: ratio(%) = account's own SP(MV) / all-time producer reward SP(MV) * 100% Ratio value less than 100% indicates power-down. If witness does additional power-up or gets other types of reward(e.g., curation reward), the ratio may exceed 100%. This does not take witness' other accounts into consideration. All-time producer reward data is from @steemchiller's SDS API. Here is the result: rank account own_sp prod_sp ratio 1 justyy 2188.411MV 1284.2MV 170.41% 2 steemchiller 982.134MV 124...

파이썬에서 예외(exception) 처리

by joviansummer
original STEEMIT post: https://steemit.com/blog/@joviansummer/exception


파이썬에서의 예외(exception) 처리 예시입니다. try와 except 구문을 사용합니다.

예를 들어 어떤 수를 0으로 나누려 할 경우 예외가 발생할 것입니다.

try:
  x = 100/0
except:
  print("예외가 발생했습니다.")

위의 코드를 실행하면 "예외가 발생했습니다."라는 문자열이 출력될 것입니다.

어떤 예외가 발생했는지 출력하고 싶다면 아래와 같이 할 수 있습니다.

try:
  x = 100/0
except Exception as e:
  exc_str = str(e)
  print(exc_str)

위의 코드를 실행하면 예외 발생 메시지 "division by zero"가 출력될 것입니다.

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