Data commit

Task/Arithmetic-evaluation/Python/arithmetic-evaluation-2.py

@@ -0,0 +1,24 @@
+>>> import ast
+>>>
+>>> expr="2 * (3 -1) + 2 * 5"
+>>> node = ast.parse(expr, mode='eval')
+>>> print(ast.dump(node).replace(',', ',\n'))
+Expression(body=BinOp(left=BinOp(left=Num(n=2),
+ op=Mult(),
+ right=BinOp(left=Num(n=3),
+ op=Sub(),
+ right=Num(n=1))),
+ op=Add(),
+ right=BinOp(left=Num(n=2),
+ op=Mult(),
+ right=Num(n=5))))
+>>> code_object = compile(node, filename='<string>', mode='eval')
+>>> eval(code_object)
+14
+>>> # lets modify the AST by changing the 5 to a 6
+>>> node.body.right.right.n
+5
+>>> node.body.right.right.n = 6
+>>> code_object = compile(node, filename='<string>', mode='eval')
+>>> eval(code_object)
+16