Fix str in pool step.

workflow/scripts/pool_and_psuedoreplicate.py

@@ -247,7 +247,7 @@ def main():
             path_to_pool_control = cwd + '/' + pool_control
             if control_df.values.max() > 1.2:
                 logger.info("Number of reads in controls differ by " +
-                    " > factor of %f. Using pooled controls." % (cutoff_ratio))
+                    " > factor of %f. Using pooled controls." % (str(cutoff_ratio)))
                 design_new_df['control_tag_align'] = path_to_pool_control
             else:
                 for index, row in design_new_df.iterrows():