Bitmex Long/Short

Hello I need a Bitmex long or short script developed using Python. Preferably using the websocket API. The script should be able to.: Place a Long or short position. Position amount should be based on a given percentage of the available balance. Closing the position once it is filled with a - or + amount. Example: I am looking to long the market XBT Current XBT price is 1000 Available balance : 1 XBT Percentage I want to use or balance I want to long with : 0.3 XBT (Available balance * 0.3) = 0.3 Now after the position is filled or successfully place. I want to close it with +100 (+100 for long position and -100 from opening price for short) Close the position with price with (1000 + 100) with 1100. I hope this makes my project clear. If you have any questions please message me. Thanks Looking forward for your bids.