By Chris Roffey

ISBN-10: 1107623251

ISBN-13: 9781107623255

A different sequence that gives a framework for instructing coding abilities. Take your Python coding to the following point! booklet 2 keeps seamlessly on from Python fundamentals, supplying complete aid and innovative projects for college kids who've a few simple programming adventure and are able to circulation directly to a bit tougher fabric. you'll software and customize an easy calculator and, most significantly, examine crucial new programming rules that might make you a way more entire coder. The code is acceptable for Mac, home windows and Linux clients and for that reason appropriate with the Raspberry Pi.

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Additional info for Coding Club Level 2 Python: Next Steps

Example text

1 The start of a debugging table. Two problems should emerge from this process: • Any unexpected input such as an extra bracket produces an error in the console and no response in the calculator. g. 3333333333333333). Catching errors We can solve the first problem with a common coding technique we met first in Chapter 2: we catch errors and handle them with helpful messages. In Python this is done by putting the function that might not work after a try: clause. We then handle the error, if there is one, after an except: clause.

Try the following calculations and put them in a debugging table like the one below. Test calculations: 7*2, 7/2, 7+2, 7−2, 7*(7+2), 10/2, 10/6, 10/3, 7*(7+2)) Sum Output OK? 1 The start of a debugging table. Two problems should emerge from this process: • Any unexpected input such as an extra bracket produces an error in the console and no response in the calculator. g. 3333333333333333). Catching errors We can solve the first problem with a common coding technique we met first in Chapter 2: we catch errors and handle them with helpful messages.

You will often see code like this but you should stick to using descriptive variable names except for counters such as r and c. grid(row=r,column=c) c = c+1 if c > 1: c = 0 r = r+1 When you run the application now, all the buttons send a call to the click() function via cmd() and successfully pass along the correct button label. So finally we can put all of the code for how each button works in one place. It is good code design to separate out appearance from function in your applications. The calculator is constructed separately from the click() function.