safer default value

genomematt · Oct 5, 2016 · 1fce363 · 1fce363
1 parent 6c63cc5
commit 1fce363
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/xenomapper/mappability.py b/xenomapper/mappability.py
@@ -215,7 +215,7 @@ def single_end_mappability_from_sam(samfile, outfile=sys.stdout, fill_sequence_g
 
     pass
 
-def paired_end_mappability(wiggle, mate_density, outfile=sys.stdout, chromosome_sizes={}):
+def paired_end_mappability(wiggle, mate_density, outfile=sys.stdout, chromosome_sizes=None):
     """Create a wiggle file of read mappability using inferred mapping rate of pairs
     Arguments:
         wiggle           - a wiggle file of mappability