Warns users away from 0-point assignments. Closes #1

analyze_grades.py

@@ -68,11 +68,14 @@ def print_statistics_for_some_majors(assignment: CanvasAssignment, majors: Set[M
 
 
 def print_statistics(assignment: CanvasAssignment, major_partitions: Dict[Major, Set[CanvasUser]]) -> None:
-    print(f'Statistics for {assignment}:')
-    computing_majors: Set[Major] = {major for major in Major.majors if major.is_computing_major}
-    non_computing_majors: Set[Major] = {major for major in major_partitions.keys() if not major.is_computing_major}
-    print_statistics_for_some_majors(assignment, computing_majors, major_partitions)
-    print_statistics_for_some_majors(assignment, non_computing_majors, major_partitions)
+    if assignment.get_points_possible() == 0:
+        print(f'WARNING: {assignment} is a 0-point assignment; cannot compute scaled mean score.')
+    else:
+        print(f'Statistics for {assignment}:')
+        computing_majors: Set[Major] = {major for major in Major.majors if major.is_computing_major}
+        non_computing_majors: Set[Major] = {major for major in major_partitions.keys() if not major.is_computing_major}
+        print_statistics_for_some_majors(assignment, computing_majors, major_partitions)
+        print_statistics_for_some_majors(assignment, non_computing_majors, major_partitions)
 
 
 def print_statistics_by_section(course: CanvasCourse, assignment: CanvasAssignment,