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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 compile_code(self, user_answer, expected_output):
if hasattr(self, 'output_value'):
return None
else:
submitted = compile(user_answer, '<string>', mode='exec')
with redirect_stdout() as output_buffer:
exec_scope = {}
exec submitted in exec_scope
self.output_value = output_buffer.getvalue()
return self.output_value
def check_code(self, user_answer, expected_output):
success = False
tb = None
if expected_output in user_answer:
success = False
err = ("Incorrect Answer: Please avoid "
"printing the expected output directly"
)
elif self.output_value == expected_output:
success = True
err = "Correct answer"
else:
success = False
err = "Incorrect Answer"
del tb
return success, err
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