Rework the CQGI example

Author: adam-urbanczyk

doc/cqgi.rst

@@ -145,7 +145,7 @@ Automating export to STL
 -------------------------
 A common use-case for the CQGI is the automation of processing cad-query code into geometary, doing so via the CQGI rather than an export line in the script-itself lead to a much tidier enviroment; you may need to do this as part of an automated-workflow, batch-conversion, exporting to another software for assembly, or running stress simulations on resulting bodies.
 
-The below python script demonstrates how to open, process, and export and STL file from any valid cadquery script.
+The below python script demonstrates how to open, process, and export and STL file from any valid cadquery script::
 
       # Load CQGI
       import cadquery.cqgi as cqgi
@@ -159,19 +159,11 @@ The below python script demonstrates how to open, process, and export and STL fi
       
       # test to ensure the process worked.
       if build_result.success:
-          count = 0;
-          # loop through all the shapes returned
-          for result in build_result.results:
-              # open the output file (count variable is used here such that the output would be:
-              #   example_output0.stl, example_output1.stl, etc for each returned shape
-              with open('example_output'+ str(count) + '.stl', 'w') as f:
-                  //write the result of exporting as an STL
-                  f.write(cq.exporters.toString(result.shape, 'STL', 10))
-              f.close();
-              //increment count for more shapes
-              count = count + 1;
+          # loop through all the shapes returned and export to STL
+          for i, result in enumerate(build_result.results):
+              cq.exporters.export(result.shape, f"example_output{i}.stl")
       else:
-          print( "BUILD FAILED: " + str(build_result.exception) + "\n");
+          print(f"BUILD FAILED: {build_result.exception}")