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

Fry-IT is the company I work for

Photoalbum, both old and new.

What I have and am doing with Zope

In Swedish only. About my "Collection of Recipes" website.

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Blogs
	Interesting float/int casting in Python - 25^th of April 2006 Casting is when you convert a variable value from one type to another. This is, in Python, done with functions such as `int()` or `float()` or `str()`. A very common pattern is that you convert a number, currently as a string into a proper number.
	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