This is based on the Expression Evaluator grammar by Terrence Parr. The grammar for this example: grammar Expr002; options { output=AST; ASTLabelType=CommonTree; // type of $stat.tree ref etc… } prog : ( stat )+ ; stat : expr NEWLINE -> expr | ID ‘=’ expr NEWLINE -> ^(‘=’ ID expr) | NEWLINE -> ; expr … Read more
Pythoscope does this to the test cases it automatically generates as does the 2to3 tool for python 2.6 (it converts python 2.x source into python 3.x source). Both these tools uses the lib2to3 library which is an implementation of the python parser/compiler machinery that can preserve comments in source when it’s round tripped from source … Read more
datamap = eval(input(‘Provide some data here: ‘)) means that you actually evaluate the code before you deem it to be unsafe or not. It evaluates the code as soon as the function is called. See also the dangers of eval. ast.literal_eval raises an exception if the input isn’t a valid Python datatype, so the code … Read more