Peterbe.com (Peter Bengtsson on Python, Django, Zope, Kung Fu, London and photos)

My fun Crossword solver project. Crosstips.org & Krysstips.se

Fujian White Crane Kung Fu

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What I have and am doing with Zope

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Blogs
	MathML and displaying Math on the web - 23^rd of January 2004 My near-future hope is to set up my own weblog where each new blog item is my write-up of notes from my math lectures. The purpose of this is twofold: Study my notes from lectures Learn more about web development with odd content/format
	Calculator in Python for dummies - 17^th of December 2007 I need a mini calculator in my web app so that people can enter basic mathematical expressions instead of having to work it out themselfs and then enter the result in the input box. I want them to be able to enter "32" or "110/3" without having to do the math first. I want this to work like a pocket calculator such that `110/3` returns a `36.6666666667` and not `36` like pure Python arithmetic would. Here's the solution which works but works like Python: def safe_eval(expr, symbols={}): return eval(expr, dict(__builtins__=None), symbols) def calc(expr): return safe_eval(expr, vars(math)) assert calc('32')==6 assert calc('12.12 + 3.75 - 10*0.5')==10.87 assert calc('110/3')==36