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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
from contextlib import contextmanager
from textwrap import dedent
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
# Local imports
from .file_utils import copy_files, delete_files
from .base_evaluator import BaseEvaluator
@contextmanager
def redirect_stdout():
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 PythonStdIOEvaluator(BaseEvaluator):
"""Tests the Python code obtained from Code Server"""
def __init__(self, metadata, test_case_data):
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.expected_input = test_case_data.get('expected_input')
self.expected_output = test_case_data.get('expected_output')
self.weight = test_case_data.get('weight')
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)
submitted = compile(self.user_answer, '<string>', mode='exec')
if self.expected_input:
input_buffer = StringIO()
input_buffer.write(self.expected_input)
input_buffer.seek(0)
sys.stdin = input_buffer
with redirect_stdout() as output_buffer:
exec_scope = {}
exec(submitted, exec_scope)
self.output_value = output_buffer.getvalue().rstrip("\n")
return self.output_value
def check_code(self):
success = False
mark_fraction = 0.0
tb = None
if self.output_value == self.expected_output:
success = True
err = None
mark_fraction = self.weight
else:
success = False
err = dedent("""
Incorrect answer:
Given input - {0}
Expected output - {1}
Your output - {2}
""".format(self.expected_input,
self.expected_output,
self.output_value
)
)
del tb
return success, err, mark_fraction
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