Stephen Gruppetta @s_gruppetta@qoto.org

As it's time for my morning coffee (the coffee not the biscuits), it's as good a time as any to share my one of my favourite #programming analogies

_(narrated from a #Python-viewpoint but general enough for #coding in general)_

**The Coffee Machine - Function analogy**

Let's make some coffee…

_[read on]_

/1

#Qoto people who use #markdown, is there any link on what flavour of Markdown and what features it has or doesn't have?

Just tried using the triple back tick ``` to create a code block but it didn't seem to work. Single back ticks are fine

@johnspartan@twit.social I (and many others) use PyCharm. But VSCode is also very widely used

@johnspartan@twit.social depends what you’re looking for, but Python is very broad in terms of applications and it’s definitely a fun language

@peterdrake and yes, the article linked later has the full code etc…

@peterdrake I have been doing this (on Twitter) for a few months now, but this is an old post (from Twitter, recycled here) so the images didn’t have them. I now autogenerate these snippets which makes adding the code in ALT text easy

#Python is for serious stuff, sure, but one of the most fun modules is the `turtle` module, but…

I know, I can hear you say: "That's just for drawing simple, boring drawings, right"

Think again! Here's a great learning project that is not merely a "boring set of squares!"

You can follow the detailed step-by-step tutorial here [WARNING: game is addictive and may adversely affect your productivity!]

https://thepythoncodingbook.com/2022/04/24/python-lunar-landing-game-using-turtle-tutorial/

You'll find me easily on Twitter too if you're on there as well. That's a bigger account and get's a lot of interesting conversations going with others in the #Python world

You can see the sort of things I'm interested it there (until this timeline fills up a bit): https://twitter.com/s_gruppetta_ct

So, this thread could serve as my my #introduction

I'm Stephen. I used to be a physicist (as you can guess from the thread above) but now I focus on communicating about Python and programming and teaching coding

You can expect more varied content from me, all related to #programming in #Python, from science-y stuff like this, to fun animations using the `turtle` module (no not those boring ones!) and general Python for those learning to code at beginner and intermediate levels

There's a lot more than can fit in a single thread.

If you want to read more detail, and go through the step-by-step writing of the code to decompose & recostruct *any* image, read full article here:

#coding #2dfourierimages #2dfouriertransform #fourier

/16

https://thepythoncodingbook.com/2021/08/30/2d-fourier-transform-in-python-and-fourier-synthesis-of-images/

and another one…

Here's another example

/14

And therefore, you can reconstruct the image by adding all of those sinusoidal gratings together.

The more gratings you add, the closer the result is to the actual image

/13

Now, here's the "magical" part of #Fourier theory.

*Any* image is made up of lots of sinusoidal gratings. So, the 2D Fourier Transform of an image gives you thousands of pairs of dots, and each pair represent a sinusoidal grating.

/12

Now, if you have lots of gratings superimposed on each other, the #FourierTransform gives you a pair of dots for each of the components

/11

You can find the parameters of a sinusoidal grating by using the 2D #FourierTransform.

The dots shown contain the amplitude and phase of the grating. Their position from the centre gives the frequency, and their orientation represents the orientation of the grating.

/10

Or even better, you can use a function of both x and y to make any grating

/9

You can create a 2D sinusoidal grating in #Python using #NumPy and display it using #matplotlib

/8

There's one more parameter that defines a sinusoidal grating: the phase. Gratings with a different phase are shifted with respect to each other…

/7