Upgrade to coverage 3.7.1 and have it auto-build itself on first use.

third_party/coverage-3.7.1/coverage/xmlreport.py

 """XML reporting for coverage.py"""
 
 import os, sys, time
 import xml.dom.minidom
 
 from coverage import __url__, __version__
 from coverage.backward import sorted, rpartition    # pylint: disable=W0622
 from coverage.report import Reporter
 
 def rate(hit, num):
@@ skipping 67 matching lines @@
             bnum_tot += bnum
             bhits_tot += bhits
 
         xcoverage.setAttribute("line-rate", rate(lhits_tot, lnum_tot))
         xcoverage.setAttribute("branch-rate", rate(bhits_tot, bnum_tot))
 
         # Use the DOM to write the output file.
         outfile.write(self.xml_out.toprettyxml())
 
         # Return the total percentage.
-        return 100.0 * (lhits_tot + bhits_tot) / (lnum_tot + bnum_tot)
+        denom = lnum_tot + bnum_tot
+        if denom == 0:
+            pct = 0.0
+        else:
+            pct = 100.0 * (lhits_tot + bhits_tot) / denom
+        return pct
 
     def xml_file(self, cu, analysis):
         """Add to the XML report for a single file."""
 
         # Create the 'lines' and 'package' XML elements, which
         # are populated later.  Note that a package == a directory.
         package_name = rpartition(cu.name, ".")[0]
         className = cu.name
 
         package = self.packages.setdefault(package_name, [{}, 0, 0, 0, 0])
 
         xclass = self.xml_out.createElement("class")
 
         xclass.appendChild(self.xml_out.createElement("methods"))
 
         xlines = self.xml_out.createElement("lines")
         xclass.appendChild(xlines)
 
         xclass.setAttribute("name", className)
         filename = cu.file_locator.relative_filename(cu.filename)
         xclass.setAttribute("filename", filename.replace("\\", "/"))
         xclass.setAttribute("complexity", "0")
 
         branch_stats = analysis.branch_stats()
 
         # For each statement, create an XML 'line' element.
-        for line in analysis.statements:
+        for line in sorted(analysis.statements):
             xline = self.xml_out.createElement("line")
             xline.setAttribute("number", str(line))
 
             # Q: can we get info about the number of times a statement is
             # executed?  If so, that should be recorded here.
             xline.setAttribute("hits", str(int(line not in analysis.missing)))
 
             if self.arcs:
                 if line in branch_stats:
                     total, taken = branch_stats[line]
@@ skipping 15 matching lines @@
             class_br_hits = 0.0
 
         # Finalize the statistics that are collected in the XML DOM.
         xclass.setAttribute("line-rate", rate(class_hits, class_lines))
         xclass.setAttribute("branch-rate", rate(class_br_hits, class_branches))
         package[0][className] = xclass
         package[1] += class_hits
         package[2] += class_lines
         package[3] += class_br_hits
         package[4] += class_branches