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 파일 복사

by joviansummer
original STEEMIT post: https://steemit.com/blog/@joviansummer/67jpbq


파이썬에서 파일을 복사하고 싶을 때 shutil 모듈을 활용할 수 있습니다. shutil.copy() 함수를 사용합니다.

예를 들어 my_data.txt 파일을 복사해서 my_data.txt.bak 파일로 저장하고 싶다면 아래와 같이 할 수 있습니다.

import shutil
shutil.copy('my_data.txt', 'my_data.txt.bak')

파일 백업을 위해 복사할 때 아래와 같이 해 볼 수 있겠습니다.

import shutil

source_file = '/my_dir/my_data.txt'
backup_file = source_file + ".bak"
shutil.copy(source_file, backup_file)

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