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#!/usr/bin/env python
import sys
import traceback
import os
from os.path import join
import importlib
from contextlib import contextmanager
# local imports
from code_evaluator import CodeEvaluator
@contextmanager
def redirect_stdout():
from StringIO import StringIO
new_target = StringIO()
old_target, sys.stdout = sys.stdout, new_target # replace sys.stdout
try:
yield new_target # run some code with the replaced stdout
finally:
sys.stdout = old_target # restore to the previous value
class PythonStdoutEvaluator(CodeEvaluator):
"""Tests the Python code obtained from Code Server"""
def check_code(self, test, user_answer, ref_code_path):
success = False
try:
tb = None
test_code = test
submitted = compile(user_answer, '<string>', mode='exec')
with redirect_stdout() as output_buffer:
g = {}
exec submitted in g
raw_output_value = output_buffer.getvalue()
output_value = raw_output_value.encode('string_escape').strip()
if output_value == str(test_code):
success = True
err = 'Correct answer'
else:
raise ValueError("Incorrect Answer")
del tb
return success, err
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