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#!/usr/bin/env python
import sys
import traceback
# Local imports
from .file_utils import copy_files, delete_files
from .base_evaluator import BaseEvaluator
from .grader import TimeoutException
from .error_messages import prettify_exceptions
class PythonAssertionEvaluator(BaseEvaluator):
"""Tests the Python code obtained from Code Server"""
def __init__(self, metadata, test_case_data):
self.exec_scope = None
self.files = []
# Set metadata values
self.user_answer = metadata.get('user_answer')
self.file_paths = metadata.get('file_paths')
self.partial_grading = metadata.get('partial_grading')
# Set test case data values
self.test_case = test_case_data.get('test_case')
self.weight = test_case_data.get('weight')
self.hidden = test_case_data.get('hidden')
def teardown(self):
# Delete the created file.
if self.files:
delete_files(self.files)
def compile_code(self):
if self.file_paths:
self.files = copy_files(self.file_paths)
if self.exec_scope:
return None
else:
submitted = compile(self.user_answer, '<string>', mode='exec')
self.exec_scope = {}
exec(submitted, self.exec_scope)
return self.exec_scope
def check_code(self):
""" 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
mark_fraction = 0.0
try:
exec("from nose.tools import *", self.exec_scope)
_tests = compile(self.test_case, '<string>', mode='exec')
exec(_tests, self.exec_scope)
except TimeoutException:
raise
except Exception:
exc_type, exc_value, exc_tb = sys.exc_info()
tb_list = traceback.format_exception(exc_type, exc_value, exc_tb)
line_no = traceback.extract_tb(exc_tb)[-1][1]
if len(tb_list) > 2:
del tb_list[1:3]
err = prettify_exceptions(exc_type.__name__,
str(exc_value),
"".join(tb_list),
self.test_case,
line_no
)
else:
success = True
err = None
mark_fraction = 1.0 if self.partial_grading else 0.0
return success, err, mark_fraction
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