Replace os.popen by os.system

build_results.py

@@ -911,7 +911,7 @@ def init(output, vcf_files, true_vcf, rules, filtered_vcfs=None, type_v="del", o
 
     # Build HTML summary:
     ipynb = os.path.join(output, "Summarized_results.ipynb")
-    os.popen("jupyter nbconvert --to html --template basic --execute %s" % ipynb)
+    os.system("jupyter nbconvert --to html --template basic --execute %s" % ipynb)
 
     print_results(nb_records, orphans, with_xlsx, output, do_genotype)