This is a collection of simple scripts written using the recently released PyScript framework which allows Python code to be executed locally, entirely within the browser. I am only slightly more knowledgeable than a beginner, so nothing in here is particularly complex (compared with the work of experienced developers, this is rank amateurism on display). However, the entire point of PyScript is to bring programming to the 99%. I'm one of that group.
These scripts are in various stages of development (translation: Some might work. Some might not). If you're interested, the repo containing these scripts (and more detritus) can be found here and the PyScript repository can be found here.
A quick note on design. These pages don't necessarily use best design practices (in fact, some of these are visual trainwrecks and none are particularly polished). For example, the CSS is generally contained in the <head> or occassionally inline rather than an external CSS file. My goal with these scripts is to create single file interactive pages with no local dependencies. The same can be said of the Python code which is, in all cases, sandwiched between py-script tags at the end of the body rather than external files. I could, and probably will at some point, move the CSS and maybe some oft-used PyScript functions to files hosted at some web location and link them with the HTML via their URL.
Calculates monthly principal and interest payments on a fully amortized mortgage loan. You can optionally add annual property tax and insurance cost to calculate and total monthly payment. This is second PyScript page I ever wrote (after the temperature converter). Nothing flashy, but it does the job. I've actually used it once or twice in the real world.
Search for a dog breed to access basic information. Information is taken from api at The Dog API. I wrote this in order to practice/figure out how to work with an external web content. Ordinarily, one would use something like the
requestslibrary to interact with internet content using Python. However, for security reasons, browsers don't support the connection protocols used by these Python libraries. PyScript does provide a wrapper for JavaScript'sfetchfunction (called, predicably PyFetch) that does allow the program to access internet content. This page was my first attempt at using that wrapper.
Takes user text input then encrypts it using a Fernet cipher (It displays both the key and the encrypted text. DO NOT use for any real-world application). The encryption is handled by the third party 'cryptography' library, available at Pypi.org. The code demonstrates PyScript's ability to use third party libraries using PyScript's
<env>tag[NOW DEPRECATED]. NOTE: not all third party libraries work with PyScript. Generally speaking, compatible third party libraries are those that have been compiled to run with Pyodide. A list of compatible libraries can be found here.
Uses Python's hashlib module (in the standard library) to generate a sha-256 hash for user-supplied input.
Simple fahrenheit to celsius converter. The first PyScript page I ever wrote.
For fans of Parks and Recreation, this is a page that accesses a searchable API containing quotes from that loveable Director of Parks and Recreation in Pawnee, Indiana, Ron Swanson. As with the Dog Reference, this uses the PyFetch wrapper to access API content.
This demo runs two essentially equivalent functions, one written in JavaScript, the other in Python (executed using the PyScript framework). The code times how long it takes each function to execute, allowing you to see the speed difference between a JS function and Python function run in a browser. Predictably, JavaScript executes (this function, anyway) much faster than Python.
This is a version of the classic Rock Paper Scissors game that nearly every novice programmer writes at some point. You click 'Rock', 'Paper', or 'Scissors' and the game begins. The computer's choice is randomly selected using Python's
randommodule. This one currently presents some challenges. First, thepys-onClickaction doesn't behave in the same way as its counterpart in JavaScript. When passing arguments to the function called by thepys-onClick, the function fires on page load rather than onClick (which is how JavaScript behaves). There is currently a PR on GitHub proposing to change the behavior ofpys-onClickso that it mirrors JavaScript'sonClick. In the mean time, we can stop the function from firing on page load by passing the argument to the function prefixed withfunctools.partial. Also, to get the "Rock...Paper...Scissors...SHOOT" message to come up on the page one word at a time, we've have to useawait asyncio.sleep(n). Python'stime.sleep(n)doesn't give us the execution delay we need for the effect.
This is a so-called "Chained Digit Generator," a (very) pseudorandom number generator. You can read about the details of the underlying algorithm on the page. This page does not demonstrate any new or as-yet unexplored facet of PyScript. Rather, it's just an exercise for me in adapting functions written for other contexts for use in a PyScript driven page.
A simple page that determines whether the user-entered number is a prime number.
Just rolls two ascii dice.
A simple demonstration of the Collatz Conjecture (aka the 3x + 1 problem). Read more about it on the page.
A Shakespearean insult generator because clearly, the internet needs another one. Whatever ...
This one is pretty interesting. The idea is that you can take any 4 digit number that is made up of at least two distinct digits (in other words, not 4 identical digits, e.g. 1111, 2222), apply a set of rules to the number, apply the same set of rules to the result, and so on until the calculations yield Kaprekar's Constant: 6174 (which will, when applying the rule set, yield itself, 6174 ad infinitum). It takes, at most, 7 steps to get to 6174. Read more on the page.
This one is cool on a couple of levels. The page tells you a little about the Sierpinski Triangle (so read about it there). As far as demonstrating the abilities of PyScript, this page uses the third-party Matplotlib plotting library to draw the triangle.
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