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Quipu ======= Evaluate simple Python mathmatical and logical expressions http://en.wikipedia.org/wiki/Quipu An attempt to make a safe evaluator of a subset of Python expressions. This is mostly a proof-of-concept for getting feedback, it has not been thoroughly checked for safety, use at your own risk :) It uses the Python ast module to parse the expression, but all evaluation is done by walking the ast, it is not directly executed by the Python runtime. Nosetests are provided below including coverage of supported and unsupported operations. Known security considerations: The variables are expected to be simple primitive types. Providing functions with unsafe effects, or variables where the operator implementations can have unsafe effects is obviously unsafe. Some operations may also take a lot of time or memory and DOS the process. Usage:: import quipu result = quipu.evaluate('2 + 2') See the list of "supported_expressions" in ``test_asteval.py`` for an example of what operations are implemented.

Project description

Evaluate simple Python mathmatical and logical expressions

http://en.wikipedia.org/wiki/Quipu

An attempt to make a safe evaluator of a subset of Python expressions.

This is mostly a proof-of-concept for getting feedback, it has not been thoroughly checked for safety, use at your own risk :)

It uses the Python ast module to parse the expression, but all evaluation is done by walking the ast, it is not directly executed by the Python runtime.

Nosetests are provided below including coverage of supported and unsupported operations.

Known security considerations:

The variables are expected to be simple primitive types. Providing functions with unsafe effects, or variables where the operator implementations can have unsafe effects is obviously unsafe.

Some operations may also take a lot of time or memory and DOS the process.

Usage:

import quipu
result = quipu.evaluate('2 + 2')

See the list of “supported_expressions” in test_asteval.py for an example of what operations are implemented.

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