Makes groups output CSV format consistent with other CSV outputs

The course code is used instead of the Canvas ID.

src/canvaslms/cli/users.nw

@@ -260,7 +260,7 @@ def add_groups_command(subp):
   groups_parser = subp.add_parser("groups",
     help="Lists groups of a course",
     description="Lists groups of a course(s). Output, CSV-format: "
-      "<Canvas ID> <group category> <group name> <#members>")
+      "<course code> <group category> <group name> <#members>")
   groups_parser.set_defaults(func=groups_command)
   courses.add_course_option(groups_parser)
   <<add groups specific options>>
@@ -298,7 +298,10 @@ else:
 
 for category in categories:
   for group in filter_groups([category], args.regex):
-    row = [group.id, category.name, group.name, group.members_count]
+    row = [
+      category.course.course_code, category.name,
+      group.name, group.members_count
+    ]
     output.writerow(row)
 @
 
@@ -313,8 +316,10 @@ we can filter out groups; or filter out groups directly from courses.
 We want to filter out the group categories from a list of courses.
 <<functions>>=
 def filter_group_categories(course_list, regex):
-  """Filters out the group categories whose names match regex
-  in the courses in course_list"""
+  """
+  Filters out the group categories whose names match regex
+  in the courses in course_list
+  """
 
   name = re.compile(regex or ".*")
 
@@ -334,9 +339,11 @@ method [[.get_groups()]], so thanks to Python's duck typing we can write short
 code.
 <<functions>>=
 def filter_groups(items, regex):
-  """Items is a list of either courses or group categories,
+  """
+  Items is a list of either courses or group categories,
   regex is a regular expression.
-  Returns all groups whose name match regex."""
+  Returns all groups whose name match regex.
+  """
 
   name = re.compile(regex or ".*")