Added basic implementation for Python code evaluation

evaluators/PythonEvaluator.py

@@ -0,0 +1,32 @@
+from core.concept import ReturnValueConcept, ErrorConcept
+from evaluators.BaseEvaluator import BaseEvaluator
+from parsers.PythonParser import PythonNode
+import ast
+from core.sheerka import ReturnValue, Sheerka
+import logging
+
+log = logging.getLogger(__name__)
+
+
+class PythonEvaluator(BaseEvaluator):
+    def __init__(self):
+        super().__init__("Python Evaluator", 50)
+
+    def matches(self, context, items):
+        return len(items) == 1 and isinstance(items[0].value, PythonNode)
+
+    def eval(self, context, items):
+        sheerka = context.sheerka
+        node = items[0].value
+        if isinstance(node.ast, ast.Expression):
+            try:
+                log.debug("Evaluating python expression")
+                compiled = compile(node.ast, "<string>", "eval")
+                evaluated = eval(compiled, {}, {"sheerka": context.sheerka})
+                concept = sheerka.new(ReturnValueConcept.NAME, body=evaluated)
+                return ReturnValue(self.name, True, concept)
+            except Exception as error:
+                error = sheerka.new(ErrorConcept.NAME, body=error)
+                return ReturnValue(self.name, False, error)
+        else:
+            raise NotImplementedError()