September 2017
Intermediate to advanced
240 pages
5h 57m
English
Content preview from Learn More Python 3 the Hard Way: The Next Step for New Python ProgrammersBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Exercise 36. Simple Calculator
This challenge is to create a simple algebraic calculator using everything you’ve learned about parsing. You’ll need to devise a language for doing basic math with variables, create an ABNF for the language, and write the scanner, parser, analyzer, and interpreter for it. This may actually be overkill for a simple calculator language since there won’t be any nested structures like functions, but do it anyway to understand the full process.
Exercise Challenge
A simple algebraic language can mean many things to different people, so I want you to play with the Unix command bc. Here’s an example of me running the bc command:
$ bc bc 1.06 Copyright 1991—1994, 1997, 1998, 2000 Free Software ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.