417 Archived Topics
Remove Filter  | Just a few more explorations using a Python class to mimic a C Structure or Pascal Record. Loading the record from a csv type data file, displaying the data and sorting and searching the data in various ways.  |
| | Just a simple text editor using the Tkinter expansion TIX. You are encouraged to improve this program with added functions. TIX is included with the latest Python distributions.  |
| | You have to mildly trick Windows, but it is possible to put a bitmap image on your console. Uses a flock of WinApi calls. Works well with the free PellesC compiler and Dev-C++. This is a Windows Console Application. Drop me a comment, if you have luck with another compiler. |
| | The computer is a binary beast. We want to go from the one-fingered digital box to the ten-fingered human being and convert binary to denary(base 10) numbers. This is how it works, for instance, binary 10010 is calculated as 1*16+0*8+0*4+1*2+0*1 = decimal 18. Just because it's easy, let's throw in … |
| | This code snippet allows you to list the files in a folder sorted by "last modified date". The tuple returned by the os.stat() function contains amongst other things the last modified date, which is then converted by the time.localtime() function to a tuple that is ideal for sorting. You can … |
| | I borrowed this from C#, where you can easily send output, that normally goes to the ugly black console window, to a nice looking Windows MessageBox with an OK button to close after you read your results. You can accumulate your output in a string to send to one message … |
| | This snippet explores the change of a hexadecimal (base 16) string to a denary (base 10) integer and the reverse. Interestingly Python allows the representation of the hexadecimal string in two different forms. For instance 255 can be changed to 'FF' (also 'ff') or '0xff'. Any of these hexadecimal strings … |
| | The code shows a fast prime number generator using a sieve algorithm. It looks at only odd numbers. Technically 1 and 2 are prime numbers too, since they are only divisible by unity and themselves, exceptions are made for 1 and 2. Zero and negative numbers return an empty list. … |
| | Take a look at a typical Windows GUI frame (form) with a menubar, statusbar, panel, label and buttons. Set the font and size of text, click the buttons to create some events. All of this and much more is in the free wxPython package. |
| | Version 2.6 of wxPython has support for playing animated gif image files. The example sets up a panel on a frame and then uses wx.animate.GIFAnimationCtrl() to do the hard work. Actually pretty simple code. |
| | Folks have asked numerous times for a code snippet of a binary search of an array. Here is heavily commented code with a few test printf() included to give you a picture of what is going on. |
| | Python does not have a type like struct in C or record in Pascal, but it can be easily implemented with a class. This little code snippet shows you how to do it.  |
| | I couldn't find a meaningful code sample for the wxPython slider (wx.Slider), so I concocted this one and added a few explanations. It explores two different sliders, one is horizontal, the other vertical. The slider events are then fed to a function that retrieves the position values and displays them … |
| | Converting a decimal integer (denary, base 10) to a binary string (base 2) is amazingly simple. An exception is raised for negative numbers and zero is a special case. To test the result, the binary string is converted back to the decimal value, easily done with the int(bStr, 2) function. |
| | I am still trying to take a look at the gtk GUI package and reinstalled the following: gtk-win32-devel-2.8.6-rc3.exe and pygtk-2.8.2-1.win32-py2.4.exe (updated version) I have it down to a simpler error message now. Here are my warnings and errors with the sample file base.py [code]Traceback (most recent call last): File "D:/Python24/Atest/Demo/pyGTK/base.py", … |
| | Is it Mother Date and Father Time? Any way, getting all the different date and time displays working can be imperturbably perplexing at times. You take a look at it in this Windows Console Application. |
| | If a word or sentence reads the same way forward and backward, then it is a palindrome. A small admonition is in place, whitespaces and punctuation marks can be ignored. Also, all the letters should be in one case, lower or upper, your choice. Ideal for Python to show off … |
| | Early versions of Python used a hybrid of samplesort (a variant of quicksort with large sample size) and binary insertion sort as the built-in sorting algorithm. This proved to be somewhat unstable, and was replaced in version 2.3 with an adaptive mergesort algorithm. I am comparing several rudimentary sorting routines, … |
| | The function Delay() allows access to other events during the delay. For instance a certain key could be used to interrupt a lenghty delay. The Win32 API function Sleep() ignores events, maybe it should be called DeepSleep().  |
| | You can access the sound chip to play midi voices using winmm.lib, or in case of Dev C++ the libwinmm.a library. There are 128 midi voices to pick from, anything from the Acoustic Grand Piano = 0 to the Gunshot = 127. |
| | [B]Search for your answer first![/B] If you're having a problem, chances are good that someone else has had the same problem. Please search the forum for existing answers before starting a new thread. Nothing is more irritating to a long time member than to answer the same question for the …  |
| | One more application of the Python Image Library (PIL). This short code creates thumbnails from all JPEG files in the current folder. The thumbnail image file is prefixed with a T_ and saved to the same directory. The program checks for existing files with this prefix, so we don't create … |
| | Hello, I am vegaseat, the goofy moderator from the Python forum of DaniWeb. I wanted to know if anyone in the Java forum has played around with Java based Python, also known as Jython. Jython uses easy to learn Python syntax and can use the Java libraries. To make a … |
| | Continued fraction expansion is a simple way to approximate common trigonometry functions to a relatively high precision. In this example we only look at sin and cosine. The results compare well with the results of high precision packages like SymPy. The Python module decimal is used to achieve the high …  |
| | You need the Python tkSnack module to play notes of a given frequency and duration on your external sound system (attached to the PC's sound card). The code snippet gives just a tiny hint about the capabilities of tkSnack. It works with Tkinter, normally part of the Python installation. The … |
| | Probably the simplest way to get into multimedia with Python is the webbrowser module. This works with both Windows and Unix systems, and selects the default browser you have installed. But that is not all: if you give it the name of a multimedia file it will select the default …  |
| | The tkSnack sound module was developed at KTH in Stockholm, Sweden. A great module to generate sound, play and analyze sound files and speech. It was written using Tkinter and its native TCL language. Alas, the latest release is from 2005. However, the important file tkSnack.py can be converted to … |
| | Crypting with xor allows one to write one function that can encrypt and decrypt a file. In this example a text file is used, but it could be an image file as well. Once you have created the encrypted file you simply send it through the same function again to … |
| | I am afraid, I am starting to like C#, despite the somewhat bloated .Net Framework requirements. Mister Bill's Microsoft is very supportive though. The language has a nice flow compared to GUI programming in C++. Here we are looking at a standard ListBox, add some items, sort them and select … |
| | Here we experiment with a gauge or progress bar made from a label displaying a variable number of spaces in color. In this example, we use from 0 to 100 spaces. This label based gauge allows you to choose many different colors, and you can even change the color as … |
| | Does anybody have a tested function in C or C++ that sends text to the printer in a Windows Console Application? I would be very appreciative! It would be nice, if I could specify the font. Yes, I can google! |
| | This little code snippet shows you how you save a wxPython canvas drawing to a standard image file. |
| | Suddenly I am interested in the tcl scripting language. Does anybody know a good website to learn the rudimentaries. |
| | The map() function applies a function to every member of a list. Here a list of numbers 32 to 255 is changed to a list of the corresponding ASCII characters. Then map() is used in a more complex application to combine the two lists to form a dictionary containing number:character … |
| | Compress and decompress files using the popular pkzip format and the Python module 'zipfile'. [B][COLOR="Red"]Concept Error! This code just does archiving into a zip file, no compression![/COLOR][/B] To compress and archive files it is best to use module tarfile, see the snippet at: [url]http://www.daniweb.com/code/snippet216860.html[/url] |
| | If you bind a Tkinter widget to an event, normally only the event information is passed to the function responding to the specific event like a mouse click. Python allows you to expand the event handler to include any number of values to be passed on. Here is a typical … |
| | This code sample shows how to represent employee data as a list of dictionaries. This list can be sorted and grouped by dictionary keys. In this particular example, I demonstrate how to calculate each department's average age from the data after sorting and grouping. The code is heavily commented to … |
| | Python programming can have its lighter moments. Here we use one of those moments to draw an optical illusion using the Tkinter canvas to draw a rectangle, some lines and circles. |
| | Do I have to spell it out for you? This short C code will do just that. It will spell out an integer number in English words. The banks do that on large checks, and it would be nice to get one of those every now and then. |
| | The code is shamefully short, but here it is. Now you can listen to the many sound files in wave (.wav) format and boing, chirp, chime, bark, booh, laugh and mooh at the people around you. |
| | A simple program to count the words, lines and sentences contained in a text file. The assumptions are made that words are separated by whitespaces, and sentences end with a period, question mark or exclamation mark.  |
| | The wxPython GUI toolkit makes a very nice plotting component/widget available. You can select line or marker plotting, or a combination of both. All you have to supply is a list of x,y point tuples. Other features include zooming and printing. |
| | Write a Python program that creates upside down sentences, like [B] upside down --> umop apisdn [/B] The sentence above is flipped 180 degrees around the end. Some freedom allowed, like an 'a' upside down and reversed is the closest thing to an 'e'. Conversely a 'w' would be a … |
| | Let Python do the work for you and figure out the roman numerals for a given integer. I have to ask you to keep the integer values somewhat reasonably low (from 1 to 4999), since roman numerals from 5000 on use characters with an overline and most PCs don't have … |
| | Starting with version 2.6 Python has introduced a new container called the named tuple. You can use it similar to a class based record structure, but it has the memory efficiency of a tuple. |
| | The Python module 'tarfile' is more flexible then it's counterpart 'zipfile'. It allows you to simply archive files without compression, or use the gzip format of compression, or the super compression format bzip2. Here is code to show you the use of the module. |
| | A short look at creating lists of file names or full path names using the versatile Python module glob. Glob follows the standard wildcard protocol. |
| | A little late for April 1, but here is the secret code ... [code]searchEngineNames = [] for c in range(ord('A'), ord('Z')+1): name = chr(c)+'ing' searchEngineNames.append(name) # pick #1 print(searchEngineNames[1]) [/code] |
| | Looking at the First In First Out (FIFO) data situation. Just like a line at the grocery store check-out. Its counterpart FILO would be like a stack of dinner plates. |
| | A demo of the Tkinter listbox widget that shows you how to create the listbox, make it scrollable, position it within a grid, load it with data from a file, select a line of data with the mouse and display it. Also, sort the lines, add a line, delete a …  |
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