2,322 Reusable Code Snippet Topics
Remove Filter  | |
 | Use Google's modern Go language (aka. golang) to convert a denary number (base 10) to a roman numeral. Just a good exercise to explore Go's map, slice, sort and for loop features. Note that in Go the **:=** is shorthand for assigning a type (by inference) and a value to … |
| | Just an example of a persistent list class that could have interesting applications in data mining. |
 | This is just for fun. You know how old you are(I hope), but do you know how many days you are walking around on this planet? The two routines presented here could be used more practically in an ever present employee application. |
| | |
| | Sometimes it's easier to pick an image from the internet to display in your Python Tkinter GUI toolit program. |
| | Shows how to convert a comma separated value (csv) string to a list of records, and then do some data processing. The csv strings usually come from csv files created by spreadsheets. |
| | Let's assume you would have to design a 500 ml (about 1.1 pint) food/beverage container like a can and use the least amount of material. Here is a Python program that explains the steps to achieve this. |
 | A while back, I was working on some web pages that required a tabbed menu at the top of the content. In addition, the requirement was that the page should not perform a post back when the user clicked on the individual tabs. It was very important to have a … |
 | # Determine if a namespace/variable-name exists # ## Check for namespace existence in your environment variables and objects before writing to them. ## **Guess if "Book1.chapter22.paragraph37" exists without provoking errors and retrieve/send data if it exists with simplest JS expressions.** Call syntax: isNS( [string], [num] ); Example: var nsresult = … |
| | This is a special purpose boot loader for a system I've called Proto-Sys. Eventually it is going to become a 64 bit application that will encompass all the resources to hook into drivers, benchmark code and optomize algorithms. Synopsis: * Preserve registers as they were passed by BIOS * Create … |
 | Hi all. This is somewhat the equivalent of .NET String.Format(String, Args); Usages: 'Hello {0}'.format('DaniWeb!'); String.format('{0} {1} {2}', 'Hi', 'Again', 'Good Fella'); String.format('Hello {prefix} {name}', { prefix: 'Sr.', name: 'HeyHeyHey'}); I know there's lots of String.formats out there(some simpler and some more complex), but this is the one i've been using … |
| | I have seen several posts through the years with questions about navigation menus. Menus can be built using different approaches. This example is easy to build and simple to integrate with your site. The menu is built only using HTML and CSS so you don't have to have a lot … |
 | So I was recently working on a string program where the strings were easily megabytes long, and I ran into problems with there being out of memory exceptions etc. So I said to myself, this would be a perfect problem which lazy execution solves. Here is a split function that … |
 | Earlier I posted a snippet which showed [how to create a 2 dimensional string array from an SQLite database table](https://www.daniweb.com/software-development/csharp/code/494083/sqlite-database-table-to-2-dimensional-string-array-). This snippet is the reverse, if you will, where we create an SQLite database table from a 2d string array. It should be noted that this code has it's limitations, … |
 | =======Download The Full Solution Below======== This will be my last VB.Net soure as I've made the move to C#. For a recent job application I was given the technical test to create a horse race simulator which would calculate the odds of a runner winning a race of up to … |
| | This shows you how to create a flashcard like quiz game using a Python dictionary. It's up to you to explore the approach and make this a more meaningful game. |
| | I was working on this function which was quite specific to my project, so thought I'd make it more generic and share it, since I could find very little on the subject in my searching. Code also demonstartes how exceptions can work to your advantage when you know they are … |
 | Here is a PHP class written for PHP4 and PHP5 that will validate email addresses by querying the SMTP (Simple Mail Transfer Protocol) server. This is meant to complement validation of the syntax of the email address, which should be used before validating the email via SMTP, which is more … |
 | This snippet demonstrates how you can add VBA code to an Excel file at run time. **Prerequisites** In this snippet I am using Microsoft Excel 2013 with the Microsoft Excel 15.0 object library. Before you can use this code, you will have to change a setting within Microsoft Excel to … |
| | This "FakeWebClient" will allow a C# application to send and receive cookies as part of the request. This behaviour is not available by default. Please note that on line 35 there is a possible NullReferenceException, I managed this at a level higher but you may wish to handle it in … |
| | For a small class it doesn’t matter that much, but for a bigger class I find it handy to have an oversight of all the methods at hand. That’s what I did here. One requirement is that the class file has already been compiled error free. Don’t know if my …  |
| | The Tkinter GUI toolkit's canvas object is very nice for all sorts of drawings and plotting. However, when it comes to saving the image Tkinter limits you to postscript printer files. One solution is to draw the same image in parallel on PIL's image-draw object in memory. This is made … |
 | Hello , today I was developing a short url system and I created this class to help me encode / decode integer (id) to small string. That way for example “Ac” means 3674 . Because I believe that it may be helpful to others too I share it here. Notice … |
 | I just love generators in Python. One of the cool things I found out from [this](http://nedbatchelder.com/text/iter.html) site was that one could send in a value when calling on an active generator. To do so one uses the send() method and a yield like so: "x = yield". The send with … |
 | This is a very simple login form. I set it up so that the form won't close until it's cancelled or a valid username and password are entered. I chained the check for the username and the check for the password, so that if the username doesn't pass the password … |
| | I realized that I haven't released any snippets in a while so I figured while I was working on some interesting projects of my own that I would release one that I recently decided to write because I don't see the algorithm out there in C# very often. This snippet … |
| | We have had several snippets on the format() function. This one gives a condensed overview of the many options you have. |
| | A very basic pygame sprite example. Moving a sprite with the arrow keys, could be the start of a great space game. |
| | As a result of my research in number theory I find that I often need to break a number down into its numerical parts while stepping through one divisor to another. I call this process "break factoring," as I am just breaking a number down into parts, and not necessarily … |
| | Also because of my work in number theory, I often need to have the root floor and root ceing of a number. This is my function for computing those two numbers from a target number. |
| | I do a lot of work in number theory, especially with factors. I often need just the two middle factors from a very long factor list/result, so I created a function that takes a factor list and returns just the middle two, or one, factors. Nothing earth shattering, but I … |
 | @Niloofar24 was looking for an Iranian datetime package and last night I found one in the internet so I wrote a simple code which counts the days and hours and seconds to Iranian new year |
| | Instead of using letters as substitutes for playing card suits, I came up with a way to use unicodes to produce the common suits. The following creates the coded needed, makes the deck, and then prints the deck. The printing was the hard part. Is 2.7, and should be 3.0+ … |
| | Well I done it! Got bored after the holidays and bought a Raspberry Pi credit card sized computer ($35), the least expensive LED TV and a Logitech wireless Keyboard/Mouse combo. The way I ordered the kit it cost almost twice as much, but it came with a good 2.5A powersupply, … |
| | One way to find the shortest distance between a series of surface (x, y) points is to let Python module itertools find the non-repeating combinations of point pairs. Now you can apply the Pythagoras' theorem to find all the distances and the minimum distance. |
| | This is a PyEditor I made because I couldn't get a IDLE working on windows 95. |
| | The following snippet is a simple PHP Pagination Script which I wrote. As far as I know it works fine. It is meant to be used within a class, and I have wrapped in in a class in order to demonstrate it's usage. The example given below will return something … |
| | A simple code example on how to play wave sound files with the Python module PyGame.  |
| | A simple way to find out a Python module's location on your drive.  |
 | This is a program I just recently completed for a computer science course. Given a 2D grid, where every path between two gridpoints has a weight (path length) associated with it, this program computes the shortest path from (1,1) to (m,n). You are only allowed to move up and to … |
| | Fill in your birthday in the DateTime structure and get your sign as a string. Get an extra (an element associated whith the sign) via the out parameter thanks to C#! This switch statement uses returns all over the place, so a break staement is not needed. |
| | I'm a great fan of extensions in C#. See also this previous [snippet](https://www.daniweb.com/software-development/csharp/code/467292/squaring-an-integer-with-extensions). Extensions are really simple to use. Start with adding a static class containing static methods. Note the special use of the keyword `this` in the Times extension method. The next code snip is how you could use … |
| | I used csv data readily available from http://www.weatherdatadepot.com/ to create a multiline plot of the average monthly temperatures of a given location. |
 | Grabs the location and name of the script file itself. |
| | Two third party Python modules imageio and visvis make it easy to load and view images. The modules come with the pyzo scientific package or can be downloaded separately. Module imageio can read many image file formats as shown in http://imageio.readthedocs.org/en/latest/formats.html You could also replace your image file name directly …  |
 | Python helps in real life situation to automate things. This program helps you to prep up your kids ability to go over/under ten, which is essential not only by itself, but also when calculating with bigger numbers. Program is not any special, but shows how useful Python can be in … |
| | Knowing the longitude and latitude coordinates of two cities you can calculate the distance between them. Use the code in https://www.daniweb.com/software-development/python/code/490561/postal-code-zips-and-location-python to find the coordinates. |
| | Using http://download.geonames.org/export/zip/ you can get postal information for most countries in the world. The raw data string can be transformed into a Python list of lists that can be searched for zip codes, locations, longitude and latitude coordinates. |
 | A look at [Dataset](http://dataset.readthedocs.org/en/latest/) and easy and Pythonic way to create a database. Other candidates in this categorie,i will mention [pyDAL](https://github.com/web2py/pydal) and [Peewee](https://peewee.readthedocs.org/en/latest/). I did some test of Dataset in this [post](https://www.daniweb.com/software-development/python/threads/490219/how-can-i-creat-e-text-file-to-use-as-a-database-in-python) to look at. So here a common task some web-scraping of food recipes(just a task i did help … |
| | I uploaded a module named [symboldict](https://pypi.python.org/pypi/symboldict) to the python package index (pypi). This snippet shows how to use it to create a dictionary of symbols from various modules. This dictionary can be used as a common language shared by several modules. It can be used to load python libraries in … |
The End.