Programming

What is brainfuck? Brainfuck is a programming language This is the definition from Wikipedia: The brainfuck programming language is an esoteric programming language noted for its extreme minimalism. It is a Turing tarpit, designed to challenge and amuse programmers, and is not suitable for practical use. Its name has been variously bowdlerized. The name of the language is generally not capitalized, although it is a proper noun. This programming language is very easy to learn, very hard to do work with. As the Wikipedia article describes it; the language is an esoteric language, which means it was created for fun I discovered the language while I was reading an article about writing the perfect settings file for Django. The author used DPaste website to link to pieces of code. DPaste website says that it uses Pygments for syntax highlighting. Pygments say that their syntax highlighter even supports brainfuck. And that’s how I got to brainfuck After I read articles about the language I wanted to test some code of it, I found some online interpreters, but I wanted to test some code on my machine. I found a compiler for it, but I’m using Windows 7 on my machine and the compiler is not compatible with it. I got pissed off and I decided I have to write my own interpreter ...

In my faculty – Informatics Engineering, Damascus University -, in the 4th year of Software Engineering Department, we have to build a compiler :shock:. I like using NetBeans for developing applications, it supports lots of languages and tools; like C, C++, Java, Python, Ruby and more. The compiler would be implemented in C++. The first two phases of implementing a compiler are: building a lexer (tokenizer) and building a parser. The lexer is implemented using GNU Flex while the parser is implemented using GNU Bison. The Problem The first problem I faced when starting the project was to tell NetBeans how to handle the lex file: The lex file must be passed to the flex tool to generate a C++ code file. The second problem was that when the code file is generated it contains errors: #ifdef __cplusplus #include <stdlib.h> class istream; #include <unistd.h> When using building the file you’ll find that it contains errors regarding the usage of istream. (You might not face this problem, then you’re a lucky programmer). ...

I was upgrading my Django Bookmarks site, and I wanted to list the online users. I searched the internet and I found a simple method, but it doesn’t work properly. So I developed my own method. Why the simple method didn’t work? The problem with it is that it depends on the last login date in the user model. This field is updated on every login for the user. Imagine the following scenario: The user X logs in @ 1:00 pm. The user X posts a new post @ 1:30 pm. The user X comments on a previous post @ 1:35 pm. The user X leaves the website @ 1:40 pm. The user X comes back to the website @ 3:00 pm. The user X is logged in since the session cookie has not expired yet. The user X posts a new post @ 3:15 pm. A guest enters the website, and looks at the online users corner. The guest won’t see X’s name in the list of online users, simply because X’s last login date is @ 1 pm, even though user X is now online and he has just posted a new post. ...

I'm Learning Python part 10 <p> <h1 style="font-size:18pt;font-family:Verdana;"> (last one) </h1> <p> <img src="http://www.python.org/images/python-logo.gif" alt="Python Logo" title="Python Logo" /> </div> <h1 style="font-family:Georgia;"> Back to blogging </h1> <p> As usual, I will apologize for not blogging for a long time.<br /> I have been very busy, university exams, university projects, job projects, teaching and learning. </p> <h1 style="font-family:Georgia;"> Python Course </h1> <p> At Damascus University, in the faculty of informatics we managed to create free courses to students, and I was one of the teachers there, I taught Python to students.<br /> As far as I know this course was the first Python course in Damascus University.<br /> Even though the students were a few (actually a very little few about 8 ~ 10 students) the course was great. We managed to learn Python 2.6 Syntax, a little bit of its standard library and a little bit of PyQt4 in about 7 days x 2 hours daily.<br /> As far as I know too, students understood it and found it great, and I hope they&#8217;ll be using this great language more in their programs. </p> <h1 style="font-family:Georgia;"> Why last one? </h1> <p> The tour with Python ends here, while it ends here it starts here too, it ends here because so far you&#8217;ve learned what you need to start your own path in Python. And it starts here because you&#8217;re fully equipped with the base tool to discover more tools, I&#8217;ll let you discover the standard library and 3rd-party libraries on your own, because everyone differs in his/her interests.<br /> I&#8217;ll be blogging more on more technical issues but they might not be I&#8217;m Learning Python series :).<br /> Let&#8217;s stop talking here and move directly to the heart of our last lesson.<br /> ...

I’m Learning Python part 9 <p> <img title="Python Logo" src="http://www.python.org/images/python-logo.gif" alt="Python Logo" /></div> <h1 style="font-family:Georgia;"> Classes In Python </h1> <div dir="ltr"> As I told you before, Python is a powerful programming language, and powerful it won&#8217;t be without Object Oriented design. </div> <div dir="ltr"> Python supports both Pure Object Oriented Programming (Every thing must be in a class) and Structural Programming (You can type code everywhere). </div> <div dir="ltr"> It supports also other programming paradigms like Functional Programming. I won&#8217;t write about OOP and its uses, why we should use it, I&#8217;ll just give you the keys to use OOP in Python. </div> <h1 style="font-family:Georgia;"> Defining a Class </h1> <p> Classes in Python are defined like this: </p> <p> ...

I’m Learning Python part 8 <p> <img title="Python" src="//www.python.org/images/python-logo.gif" alt="Python" /></div> <h1 style="font-family:Georgia;"> Python 3.0 </h1> <p> Since the last time I wrote an article Python many changes happened in my life, one of them is the release of Python 3.0 (Which is known also as Python3K and Python3000). </p> <p> Python 3.0 is the first intentionally backwards incompatible Python release, which means that there are some changes you must notice before start coding in Python 3.0. </p> <p> Don&#8217;t worry that much, the language has become more useful, and also there is <a href="//docs.python.org/library/2to3.html">2to3 source-to-source conversion tool</a> which converts your Python 2.x code to meet the requirements of Python 3.0 🙂 </p> <p> To find more about change in Python please refer to <a title="What's" href="//docs.python.org/3.0/whatsnew/3.0.html">Python website</a>. </p> <p> ...

I’m Learning Python (part 7) <p> <img title="Python Logo" src="http://www.python.org/images/python-logo.gif" alt="Python Logo" /> </p> Apology: First of all I wanna apologize for being late with this part, I’ve had busy days first during Shaam 2008 expo and second during some studies at the college and last busy time past launching Bawabaty project. ...

I’m Learning Python (part 6) <p> <img title="Python Logo" src="http://www.python.org/images/python-logo.gif" alt="Python Logo" /> </p> Dictionaries Dictionaries in Python are like dictionaries in life, they consist of key-value pairs, each key maps a value, values can be any object type, and keys also. Keys must be unique, I mean that we can’t have two identical keys with different values. ...

I’m Learning Python (part 5) <p> <img title="Python Logo" src="http://www.python.org/images/python-logo.gif" alt="Python Logo" /> </p> String Is Immutable? Last time I told you to try to change a specified character, you must have failed if you tried: >>> s[0] = ‘c’ The error you’d get is: TypeError: ‘str’ object does not support item assignment This means that strings are immutable, so are core-types, numbers and tuples, they can’t be changed, while lists and dictionaries can be changed freely. ...

I’m Learning Python (part 4) <p> <img title="Python Logo" src="http://www.python.org/images/python-logo.gif" alt="Python Logo" /> </p> Why Use Built-In Types? Most of the time in programming you’ll use lists, stacks, arrays, queues and dictionaries, so instead of constructing them, Python gives you a bunch of built-in types to use. The built-in types implement the semantic of the type ADT (Abstract Data Type), and they are fast, ‘cuz some of them are written in C and C++. ...