Software Development Forum

This short code lets you create a base64 encoded image string, that you can copy and paste into your Python program code to display relatively small embedded images. For a typical application see: [url]http://www.daniweb.com/code/snippet393.html[/url]

Small image files can be embedded in Python code using the base64 encoded string of the image. If you have to present a number of small fixed images in your program, embedding might be easier than including a set of image files. Attached files can be lost, and than your …

Here is a generator function using find() to do a search for all the occurances of a substring in a text. It will give you all the positions/indexes within the text where the substring is located. The sample text here can be replaced by text read in from a file.

This snippet takes a look at Python file handling. Different ways to write and read text files, zipped files and memory streams. Investigates how to access only part of a file. Also explores the "read" of a binary image file and performs a hex-dump of the data.

This code shows you how to build a multiline story string that should display similarly to way it shows in the code. It should be relatively easy to maintain.

For loops in Python are quite versatile. The little keyword "in" allows you to loop through the elements of all kinds of sequences, may the elements be numbers, characters, strings, objects like tuples and more. Here is an example comparing range(), xrange() and a generator similar to xrange().

Years ago I wrote a little screen-saver in Delphi that randomly put colorful circles all over the screen. A hit with the secretaries in the office. I modified a simple Tkinter based snippet to put the same colorful circles all over a window form at random locations, random radii and …

Find the maximum element in an unsorted array using recursion

Here is a list of macros I have been using.

This code enables one to find the height of a binary tree using a queue and a marker.

VPython's fame is with 3D animated modeling, but it's plotting abilities, while not flashy, are easy to understand and very useful. This program uses VPython to plot math functions y = sin(x) and y = cos(x) and y = sin(x)*cos(x).

Here's a cute little encipher/decipher program with a Tkinter GUI I wrote a while back. It's an implementation of a derivative of the Vigenere algorithm; the algorithm is taken from Laurence Smith's Cryptography: The Science of Secret Writing, Amazon link here. It's a dated book (and the technique itself is …

If the user tries to put 80 characters in a 20-character buffer, you may have issues. This snippet shows one way to cap the input and discard excess input. [i]See also [url=http://www.daniweb.com/code/snippet280.html]Safe Version of gets()[/url] and [url=http://www.daniweb.com/code/snippet278.html]Read a Line of Text from the User[/url].[/i]

This question came up on the forum. How do you swap two numbers without using a temporary variable? I used all the power of my brain to solve this at four o'clock in the morning. In all fairness, swapping two numbers using a temporay variable is about five times faster. …

Python has a module specifically made for timing built-in or owner coded functions. This code snippet explains how to use this feature.

The psyco module has been around for a while and has been used to speed up the Python interpreter. For those of you who think speed is all important, take a look at a typical example. Psyco is similar to Java's just in time compiler. How does psyco do it? …

Python24 introduces the function decorator that lends itself nicely to the timing of a function. As a sample function we are using the ever popular and rather stodgy prime number generator. The prime number generator seems to exist only to fluster students and to make niggling comparisons of the speed …

This snippet shows one way to calculate the number of days since a given date until present time. Note that this code will not work for dates outside of the current epoch, which typically begins on January 1, 1970.

This program use a while loop to delete trailing spaces and tabs from a string. It is meant to be more of an example of the application of the while loop.

Commonly strings consist of ASCII characters, some are printable, some are in the backgrounds like the bell, carriage return, linefeed, tab and so forth. This code displays a table of ASCII characters and the corresponding decimal value. As always, you are encouraged to learn here.

Just a colorful ten second countdown to New Year. Hope you can learn some code from it.

The Python module zlib allows you to compress a typical text string to about one half its original size. A handy feature when you have to transmit or save a large amount of text or data. It saves you time both writing and later reading back the compressed file. The …

Python uses C syntax to perform bitwise operations. Take a look at code that introduces you to bitwise operations at the binary level.

If you have a Windows computer you can play musical beeps through the internal speaker. In this case it will sound like a very tiny Big Ben, brought to you by the module winsound and its method Beep().

Some issues, such as leading whitespace and trailing characters that cannot be part of a number, were not handled in [url=http://www.daniweb.com/code/snippet357.html]Read a Floating-Point Value from the User, Part 1[/url]. Here such issues receive lip service. [I]See also [url=http://www.daniweb.com/code/snippet597.html]Read a Floating-Point Value from the User, Part 3[/url][/I].

Obtaining user input can be done in many surprisingly different ways. This code is somewhere in the middle: safer than [inlinecode]scanf("%lf", &n)[/inlinecode], but not bulletproof. It is meant to be a simple but relatively safe demonstration. Note also that there would be slight differences for using [inlinecode]float[/inlinecode] instead of [inlinecode]double[/inlinecode]. …

This snippet asks the user to fill in a structure and saves each record to the file. It uses append mode to add each new record to the end of the file. After all input is taken, it prints out the contents of the file. [i]Disclaimer: [font=courier new]fread[/font] and [font=courier …

Some issues, such as leading whitespace and trailing characters that cannot be part of a number, were not handled in [url=http://www.daniweb.com/code/showsnippet.php?codeid=266]Read an Integer from the User, Part 1[/url]. Here such issues receive lip service.

I know what your thinking, You and everyone else has always wanted a clock that sits at the top of your command prompt and tells you the time. Why ? I made this in first year when i spent countless hours programming and little in bed. I decided i needed …

My second C++ lab, bit of fun if i do say so my self. Its a stack that uses a linked list in C++ alot of debugging stuff still in here, but I like the debugging output anyway. Sorry about the lack of comments and

Open/Close CD tray

Did you ever want to know how how many square inches are in a square meter? This short Python code allows you to get the answer. It uses a dictionary to simplify the conversions. Could be the start of a nice GUI program using radio buttons.

The Python list container can be used for many practical things. In this somewhat light-hearted introspection of modern day politics we are looking at two lists and attempt to clear out elements that shouldn't be in both lists. No offense to anyone is intended, the outcome with the sets was …

A while ago I created a code snippet in C for the same question. Solving this question with Python is a lot simpler, and on top of that Python takes care of impossible dates with the appropriate error message.

My first experience with pointers. Learned how to spell a string foreward and backward using pointers. I hope you can learn too!

A simple experiment with the ever so popular Mandelbrot fractal graphics, call it mathematical art, nice to look at. This set of experiments loops through a number of colors to make the whole thing more exciting.

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Jumping through a few extra hoops allows you to display the common image format jpeg on a panel of the wxPython GUI window. All you need to do is to read in the image file as a binary, convert to a byte stream image and then to a bitmap. Now …

The other day I was looking at my family tree. There are my parents Antonio and Lucy Vegaseat, then my grandparents Alfonso and Ludmilla Vegaseat on my father's side and Roland and Helga Gruenspan on my mother's side. Then come my great grandparents, by now there are eight of those. …

While the calculation of the total resistance of two resistors in parallel is simple, this code shows you how to trap a number of potential errors that come with the entry of the required data. All is wrapped easily into a colorful GUI program, due to the simplicity of the …

The wxNotebook method from the wxPython module allows you to show a lot of data in a limited window space. It brings up tabbed pages you can click on to open each page. Enough said, run the code and experience the possibilities this humble method gives you.

This snippet shows one way to count the number of lines in a file. It will count the last line of a file even if the last line does not end in a newline. Usage: [code]C:\>linecnt linecnt.c lines = 32[/code]

This program was created by Gavindu Nuwan Dileepa and using this program you can add data to the stack , delete data and also you can view data from it... for more information contact [email]gavindu123@gmail.com[/email].. thanks

This is the coding needed to password any button on any switchboard from used in Access Database

How might I write an implementation in C of the standard library function [inlinecode]strcmp[/inlinecode]? Here's how I might. [i]See also [url=http://69.93.117.133/code/snippet440.html] Strings: Comparing, Case-Insensitive[/url].[/i]

How might I write an implementation in C of the standard library function [inlinecode]strcpy[/inlinecode]? Here's how I might.

How might I write an implementation in C of the standard library function [inlinecode]strstr[/inlinecode]? Here's how I might. [url=http://www.daniweb.com/code/snippet313.html]What if I need it to be case-[b]in[/b]sensitive[/url]?

How might I write an implementation in C a case-insensitive version of the standard library function [inlinecode]strstr[/inlinecode]? Here's how I might. [url=http://www.daniweb.com/code/showsnippet.php?codeid=314]But I need it to be case-sensitive[/url]?

How might I write an implementation in C of the standard library function [inlinecode]strstr[/inlinecode]? Here's how I might.

A small script which converts Microsoft Office Documents (Word, Excel, Powerpoint) to Posscript. You can build your own PDF Converter with this script. More Python/Pywin32 examples can be found at [url]http://www.win32com.de[/url] and Python based PDF Converter (for server and client usage) can be found at [url]http://www.goermezer.de[/url] .