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python Programming Glossary: self.visitExecuting 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 check self syntax tree ast.parse syntax self.passed True self.visit tree def visit_Call self node if node.func.id not in allowed_functions..
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 def check self syntax tree ast.parse syntax self.visit tree def visit_Call self node if node.func.id not in allowed_functions..
Simple example of how to use ast.NodeVisitor? http://stackoverflow.com/questions/1515357/simple-example-of-how-to-use-ast-nodevisitor course when called to visit an ast.Node of class foo calls self.visit_foo if that method exists otherwise self.generic_visit . The.. again in its implementation in class ast itself just calls self.visit on every child node and performs no other action . So consider..
Converting a python numeric expression to LaTeX http://stackoverflow.com/questions/3867028/converting-a-python-numeric-expression-to-latex getattr self 'generic_prec' n def visit_Call self n func self.visit n.func args ' '.join map self.visit n.args if func 'sqrt' return.. visit_Call self n func self.visit n.func args ' '.join map self.visit n.args if func 'sqrt' return ' sqrt s ' args else return r'.. n.op self.prec n.operand return r' s left s right ' self.visit n.op self.visit n.operand else return r' s s' self.visit n.op..
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