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How To Write A Calculator in 50 Python Lines (Without Eval)
Introduction In this post I will demonstrate how to parse and calculate an arithmetic expression a general-purpose parser. When we’re done, we’ll be able to handle expressions such as 1 + 2 * -(-3+2)/5.6 + 3, and hopefully you’ll have gained the tools to handle much more. My motivation is to provide a simple and fun lesson in parsing and formal grammars, as well as to show-case PlyPlus, a parser i
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