import asyncio
import simpleobsws
import time
 
 
async def take_a_picture(source):
    data = {'sourceName': source, 'embedPictureFormat': 'png',
            'saveToFilePath': '保存先の絶対パス'}
    result = await ws.call('TakeSourceScreenshot', data)
    time.sleep(1)
 
 
if __name__ == '__main__':
    loop = asyncio.get_event_loop()
 
    ws = simpleobsws.obsws(host='ホスト', port='ポート', password='パスワード', loop=loop)
    loop.run_until_complete(ws.connect())
 
    loop.create_task(take_a_picture('ソース名'))
 
    loop.run_forever()

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