title: How to add query with 2 parameters
body: <p>My data frame is below <code>online_rt</code></p>
  
  <pre><code>InvoiceNo   StockCode   Description Quantity    InvoiceDate UnitPrice   CustomerID  Country
  141 C536379 D   Discount    -1  12/1/10 9:41    27.50   14527.0 United Kingdom
  154 C536383 35004C  SET OF 3 COLOURED FLYING DUCKS  -1  12/1/10 9:49    4.65    15311.0 United Kingdom
  235 C536391 22556   PLASTERS IN TIN CIRCUS PARADE   -12 12/1/10 10:24   1.65    17548.0 United Kingdom
  236 C536391 21984   PACK OF 12 PINK PAISLEY TISSUES -24 12/1/10 10:24   0.29    17548.0 United Kingdom
  237 C536391 21983   PACK OF 12 BLUE PAISLEY TISSUES -24 12/1/10 10:24   0.29    17548.0 Hong Kong
  </code></pre>
  
  <p>need to find the parameters where <code>Quantity</code> is negative and <code>country=Hong Kong</code></p>
  
  <p><code>online_rt.query('Quantity &lt; 0' )</code></p>
  
  <p>i need to add one more parameter</p>
  
  <p><code>online_rt.query('Quantity &lt; 0' and 'country=Hong Kong')</code> thrown error</p>