Hope Rouselle <hrouse...@jevedi.com> writes:
[...]
> Of course, you want to see the code. I need to work on producing a
> small example. Perhaps I will even answer my own question when I do.
[...]
Here's a small-enough case. We have two students here. One is called
student.py and the other is called other.py. They both get question 1
wrong, but they --- by definition --- get question 2 right. Each
question is worth 10 points, so they both should get losses = 10.
(*) Student student.py
--8<---------------cut here---------------start------------->8---
def question1(t): # right answer is t[2]
return t[1] # lack of attention, wrong answer
--8<---------------cut here---------------end--------------->8---
(*) Student other.py
--8<---------------cut here---------------start------------->8---
def question1(t): # right answer is t[2]
return t[0] # also lack of attention, wrong answer
--8<---------------cut here---------------end--------------->8---
(*) Grading
All is good on first run.
Python 3.5.2 [...] on win32
[...]
>>> reproducible_problem()
student.py, total losses 10
other.py, total losses 10
The the problem:
>>> reproducible_problem()
student.py, total losses 0
other.py, total losses 0
They lose nothing because both modules are now permanently modified.
(*) The code of grading.py
--8<---------------cut here---------------start------------->8---
# -*- mode: python; python-indent-offset: 2 -*-
def key_question1(t):
# Pretty simple. Student must just return index 2 of a tuple.
return t[2]
def reproducible_problem(): # grade all students
okay, m = get_student_module("student.py")
r = grade_student(m)
print("student.py, total losses", r) # should be 10
okay, m = get_student_module("other.py")
r = grade_student(m)
print("other.py, total losses", r) # should be 10
def grade_student(m): # grades a single student
losses = question1_verifier(m)
losses += question2_verifier(m)
return losses
def question1_verifier(m):
losses = 0
if m.question1( (0, 1, 2, 3) ) != 2: # wrong answer
losses = 10
return losses
def question2_verifier(m):
m.question1 = key_question1
# To grade question 2, we overwrite the student's module by giving
# it the key_question1 procedure. This way we are able to let the
# student get question 2 even if s/he got question 1 incorrect.
losses = 0
return losses
def get_student_module(fname):
from importlib import import_module
mod_name = basename(fname)
try:
student = import_module(mod_name)
except Exception as e:
return False, str(e)
return True, student
def basename(fname): # drop the the .py extension
return "".join(fname.split(".")[ : -1])
--8<---------------cut here---------------end--------------->8---
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