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python Programming Glossary: ast.nodevisitorExecuting mathematical user code on a python web server, what is the simplest secure way? http://stackoverflow.com/questions/10647234/executing-mathematical-user-code-on-a-python-web-server-what-is-the-simplest-se abstract syntax tree module. This module provides a class ast.NodeVisitor for traversing the tree. This code subclasses NodeVisitor to.. safe_names set 'True' 'False' 'None' class SyntaxChecker ast.NodeVisitor def check self syntax tree ast.parse syntax self.passed True.. SyntaxError s is not an allowed function node.func.id else ast.NodeVisitor.generic_visit self node def visit_Name self node try eval node.id..
Restricting Python's syntax to execute user code safely. Is this a safe approach? http://stackoverflow.com/questions/10661079/restricting-pythons-syntax-to-execute-user-code-safely-is-this-a-safe-approach safe_names set 'True' 'False' 'None' class SyntaxChecker ast.NodeVisitor def check self syntax tree ast.parse syntax self.visit tree.. SyntaxError s is not an allowed function node.func.id else ast.NodeVisitor.generic_visit self node def visit_Name self node try eval node.id.. def visit_Name self node try eval node.id except NameError ast.NodeVisitor.generic_visit self node else if node.id not in safe_names and..
Using ast and whitelists to make python's eval() safe? http://stackoverflow.com/questions/12523516/using-ast-and-whitelists-to-make-pythons-eval-safe ast.Sub ast.Mult ast.Div class CleansingNodeVisitor ast.NodeVisitor def generic_visit self node if type node not in SAFE_NODES raise..
Simple example of how to use ast.NodeVisitor? http://stackoverflow.com/questions/1515357/simple-example-of-how-to-use-ast-nodevisitor example of how to use ast.NodeVisitor Does anyone have a simple example using ast.NodeVisitor to.. ast.NodeVisitor Does anyone have a simple example using ast.NodeVisitor to walk the abstract syntax tree in Python 2.6 The difference.. performs no other action . So consider for example class v ast.NodeVisitor ... def generic_visit self node ... print type node .__name__..
Converting a python numeric expression to LaTeX http://stackoverflow.com/questions/3867028/converting-a-python-numeric-expression-to-latex in the places it's lacking. import ast class LatexVisitor ast.NodeVisitor def prec self n return getattr self 'prec_' n.__class__.__name__..
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