fixed #18 : I can evaluate concept

src/evaluators/PythonEvaluator.py

@@ -3,6 +3,7 @@ from core.ExecutionContext import ExecutionContext, ContextActions
 from core.ReturnValue import ReturnValue
 from core.error import ErrorContext
 from evaluators.base_evaluator import EvaluatorEvalResult, EvaluatorMatchResult, OneReturnValueEvaluator
+from services.SheerkaPython import EvaluationContext
 
 
 class PythonEvaluator(OneReturnValueEvaluator):
@@ -22,7 +23,7 @@ class PythonEvaluator(OneReturnValueEvaluator):
         sheerka = context.sheerka
         fragment = return_value.value.pf
 
-        evaluated = sheerka.evaluate_python(context, fragment)
+        evaluated = sheerka.evaluate_python(context, EvaluationContext(), fragment)
         if isinstance(evaluated, ErrorContext):
             return EvaluatorEvalResult([ReturnValue(self.name, False, evaluated, parents=[return_value])],
                                        [])

src/evaluators/PythonParser.py

@@ -3,7 +3,7 @@ from dataclasses import dataclass
 
 from common.utils import encode_concept
 from core.BuiltinConcepts import BuiltinConcepts
-from core.ExecutionContext import ExecutionContext, ContextActions
+from core.ExecutionContext import ContextActions, ExecutionContext
 from core.ReturnValue import ReturnValue
 from core.error import ErrorContext, ErrorObj
 from core.python_fragment import PythonFragment
@@ -50,10 +50,10 @@ class PythonParser(OneReturnValueEvaluator):
         source_code = parser_input.as_text(python_switcher, tracker).lstrip()  # right side spaces must be kept
 
         try:
-            ast_tree = ast.parse(source_code, f"<user input>", 'eval')
+            ast_tree = ast.parse(source_code, "<user input>", 'eval')
         except:
             try:
-                ast_tree = ast.parse(source_code, f"<user input>", 'exec')
+                ast_tree = ast.parse(source_code, "<user input>", 'exec')
             except Exception as error:
                 error_context = ErrorContext(self.NAME, context, PythonErrorNode(parser_input.as_text(), error))
                 error_ret_val = ReturnValue(self.NAME, False, error_context, [return_value])