Couple of months ago, accidentally I found myself on a conference for Python developers. I thought “what the hell am I doing here”. Ok, now I got into an interesting project and have to learn Python… 🙂
My first program – Calculator:)
import webapp2 class MainPage(webapp2.RequestHandler): def get(self): # build a list of operations f = {'+': lambda x, y: str(float(x) + float(y)), '-': lambda x, y: str(float(x) - float(y)), '*': lambda x, y: str(float(x) * float(y)), '/': lambda x, y: str(float(x) / float(y)), 'C': lambda x, y: "", } # get page parameters x = self.request.get('x') y = self.request.get('y') operator = self.request.get('operator') # calculate result = "" try: result = f[operator](x, y) except ValueError: result = "Error: Incorrect Number" except ZeroDivisionError: result = "Error: Division by zero" except KeyError: pass # build HTML response buttons = "".join(["<input type='submit' name='operator' value='" + o + "'>" for o in sorted(f.keys())]) self.response.out.write("""<html> <body> <form action='/' method='get' autocomplete='off'> <input type='text' name='x' value='%s'/><br/> <input type='text' name='y'/><br/> %s </form> </body> </html>""" % (result, buttons)) app = webapp2.WSGIApplication([('/', MainPage)], debug=True)
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