title: I´m trying to filter data of colums from a Data Frame, but the index names contain white spaces
body: <p>I`m trying to filter the rows of a Data Frame, but since the index name of the column has white spaces, I've not been able to do it</p>
  
  <p>The DDTS Number is the name of the column </p>
  
  <p>It worked when there is no spaces</p>
  
  <p>data[data3.(DDTS Number) != null]</p>
  
  <p>I've tried different syntax but I don't if there is way to do it without to rename the column name </p>