This is Coinex(Futures) cryptocurrency exchange library.
Some methods included and listed blow:

• getMarketPice: get latest dealed(excution) price in market.
• getBalance: get balance of future account's wallet.
• adjust: set leverage and position type(isolated or cross margin).
• getKlines: get last up to 1000 klines in diferrent time frames.
• calculateAmount: calculate amount before open position.
• openMarket: open order( also returns position id ) in market price( always latest excution is matter ).
• openLimit: open order( must get position id with below method ) in given target price.
• getPositionId: get position id after opening a limit order.
• closeAll: close order( needs position id taken in open method or getPositionId method) in market price but as a limit close!
• closeLimit: close order( needs position id taken in open method or getPositionId method) in given target price.
• getPositionStatus: get position details such as amount of position, unreal profit etc...
• cancelPending: cancel pending order(s) of an asset.

Note: if you have an open position, you can use another openMarket/openLimit in same direction( if main position was long, open another long ) for add amount to your position or you can use another openMarket/openLimit in opposite direction( if main position was long, open short ) for sell some amount of your position.

from .CoinexFutures import CoinexFutures
import sys
coinex = CoinexFutures( "Your AccessID", "Your SecretKey" )
market = "BTCUSDT"
leverage = 10
minimum_amount = 0.0005
adjust_res = coinex.adjust(market, leverage)
if 'error' in adjust_res:
  if adjust_res['error'] != 0:
    print('[!] Failed to adjust position: {}'.format(adjust_res['message']) )
    sys.exit(0)
balanceUsdt = coinex.getBalance()['USDT']['available']
currentPrice = coinex.getMarketPrice(market)
amount = coinex.calculateAmount(balanceUsdt, currentPrice, minimum_amount, leverage)
feedback = coinex.openMarket(market, amount, 'LONG')
if 'error' in feedback:
  if feedback['error'] != 0: # means failed to open position
    print('[!] Failed to open position: {}'.format(feedback['message']) )
    sys.exit(0)
positionId = feedback['positionId']

.
.
.
status = coinex.getPositionStatus(market, positionId)
if 'error' in status:
  if status['error'] != 0: # means having trouble for getting position status
    print('[!] Failed to get position status: {}'.format(status['message']) )
    sys.exit(0)
if float(status['profit_pnl']) >= 15.0: # means this position is 15% in profit at least.
  print('[+] Closing position with {}% profits.'.format(status['profit_pnl']))
  res = coinex.closeAll(market, positionId)
  print(res['message'])