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#!/usr/bin/env python
from __future__ import unicode_literals
import sys
import traceback
import os
from os.path import join
import importlib
# Local imports
from .code_evaluator import CodeEvaluator, TimeoutException
from .file_utils import copy_files, delete_files
class PythonAssertionEvaluator(CodeEvaluator):
"""Tests the Python code obtained from Code Server"""
def setup(self):
super(PythonAssertionEvaluator, self).setup()
self.exec_scope = None
self.files = []
def teardown(self):
# Delete the created file.
if self.files:
delete_files(self.files)
super(PythonAssertionEvaluator, self).teardown()
def compile_code(self, user_answer, file_paths, test_case, weight):
if file_paths:
self.files = copy_files(file_paths)
if self.exec_scope:
return None
else:
submitted = compile(user_answer, '<string>', mode='exec')
self.exec_scope = {}
exec(submitted, self.exec_scope)
return self.exec_scope
def check_code(self, user_answer, file_paths, partial_grading, test_case, weight):
""" Function validates user answer by running an assertion based test case
against it
Returns
--------
Returns a tuple (success, error, test_case_weight)
success - Boolean, indicating if code was executed successfully, correctly
weight - Float, indicating total weight of all successful test cases
error - String, error message if success is false
returns (True, "Correct answer", 1.0) : If the student script passes all
test cases/have same output, when compared to the instructor script
returns (False, error_msg, 0.0): If the student script fails a single
test/have dissimilar output, when compared to the instructor script.
Returns (False, error_msg, 0.0): If mandatory arguments are not files or if
the required permissions are not given to the file(s).
"""
success = False
test_case_weight = 0.0
try:
tb = None
_tests = compile(test_case, '<string>', mode='exec')
exec(_tests, self.exec_scope)
except AssertionError:
type, value, tb = sys.exc_info()
info = traceback.extract_tb(tb)
fname, lineno, func, text = info[-1]
text = str(test_case).splitlines()[lineno-1]
err = ("-----\nExpected Test Case:\n{0}\n"
"Error - {1} {2} in: {3}\n-----").format(test_case, type.__name__, str(value), text)
except Exception:
raise # Exception will be caught in CodeEvaluator.
else:
success = True
err = '-----\nCorrect answer\nTest Case: {0}\n-----'.format(test_case)
test_case_weight = float(weight) if partial_grading else 0.0
del tb
return success, err, test_case_weight
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