I am dealing with a dataset that uses “..” as a placeholder for null values. These null values span across all of my columns. My dataset looks as follows: Country Code Year GDP growth (%) GDP (constant) AFG 2010 3.5 .. AFG 2011 .. 2345 AFG 2012 1.4 3372 ALB 2010 .. 4567 ALB 2011 .. 5678 ALB 2012 4.2