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import sys
from contextlib import contextmanager
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
from .error_messages import compare_outputs
@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:
self.expected_input = self.expected_input.replace('\r', '')
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):
mark_fraction = self.weight
success, err = compare_outputs(self.expected_output,
self.output_value,
self.expected_input
)
return success, err, mark_fraction
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