title: How to make a Bybit futures order with ccxt in python?
body: <p>I use ccxt for Bybit.<br>
  I can order BTCUSD(Futures Perp) by following code.<br></p>
  <pre><code>import ccxt
  
  bybit = ccxt.bybit({
      &quot;apiKey&quot;:&quot;my api&quot;,
      &quot;secret&quot;:&quot;my secret&quot;
  })
  
  symbol = 'BTC/USD'
  order_type = 'limit'
  side = 'buy'
  amount = 1
  price = 10000
  
  order = bybit.create_order(symbol, order_type, side, amount, price, {
     'qty': amount
  })
  </code></pre>
  <p>But ↓this code return &quot;ret_msg&quot;:&quot;invalid symbol&quot;.</p>
  <pre><code>symbol = 'BTCUSDU21'
  order_type = 'limit'
  side = 'sell'
  amount = 1
  price = 50000
  
  order = bybit.create_order(symbol, order_type, side, amount, price, {
     'qty': amount
  })
  </code></pre>
  <p>I wanna place order in BTCUSDU21(Inverse Futures)☹</p>