It would be nice if the Black formatter could be added natively to Pythonista.
For those who don't know about Black: this is a code formatter that makes your code PEP8 compatible and very consistent: highly recommended. See https://black.readthedocs.io/en/stable/ for details.

Any plans to support Pandas?

I am developing a package which uses the excellent greenlet module (https://pypi.org/project/greenlet/).

Alas, this seems not to be supported by Pythonista.
Can we expect this to be included in a future version?

This is to tell that I have managed to get black to use an alternative line length (160 in my case), by pip installing black. It will be installed in the site-packages (user) folder. And there, I can just patch the const.py file.
It seems to work perfectly. Hooray!

And PyTo is open source, so even if the developer is not anymore supporting the product (like seems the case with Pythonista) others can continue the product (at least in theory).

@mikael
Thanks for this great idea.
I have renamed your decorator to getter_setter, to make the purpose of it more clear.

Thus we define a decorator function:

def getter_setter(func):
    return property(func, func)

and then we can redo the example as:

class Example:

@getter_setter
def my_property(self, *value):
    if value:
        self._my_property = value[0]
    else:
        return self._my_property

or EAFP style:

class Example:

    @getter_setter
    def my_property(self, *value):
        try:
            self._my_property = value[0]
        except IndexError:
            return self._my_property

Optionally, we could define two more decorators for getter only and setter only properties:

def getter(func):
    def raise_attribute_error(*args):
        raise AttributeError("can't set attribute")
    return property(func, raise_attribute_error)
    

def setter(func):
    def raise_attribute_error(*args):
        raise AttributeError("can't get attribute")
    return property(raise_attribute_error, func)

Here is an example of a Circle class demonstrating the three decorators.
radius can be used to get the radius and set the radius (thus updating the _area attribute)
area can be used to get the area only. Setting will raise an error.
diameter can only be used to set the radius. You can’t get it.

Here is an implementation with getter_setter only:

import math


class Circle:
    def __init__(self, radius):
        self.radius = radius
        
    @getter_setter
    def radius(self, *value):
        if value:
            self._radius = value[0]
            self._area = math.pi * self._radius ** 2
        else:
            return self._radius
            
    @getter_setter
    def area(self, *value):
        if value:
            raise AttributeError("can't set attribute")
        else:
            return self._area
            
    @getter_setter
    def diameter(self, *value):
        if value:
            self.radius = value[0] / 2
        else:
            raise AttributeError("can't get attribute")

And if we use getter and setter as well:

import math


class Circle:
    def __init__(self, radius):
        self.radius = radius
        
    @getter_setter
    def radius(self, *value):
        if value:
            self._radius = value[0]
            self._area = math.pi * self._radius ** 2
        else:
            return self._radius
            
    @getter
    def area(self):
        return self._area
            
    @setter
    def diameter(self, value):
        self.radius = value / 2

@mikael
I just found out that if change the file format from PNG to BMP speeds up the animation significantly: from 4 to > 16 fps.

@ccc
Dataclasses

The latest version of Python definitely contains pandas. It is version 1.4.4.
Highly recommended!

It would indeed be nice, if we had PySimpleGUI basic functionality (what is that?) in Pythonista. But, that would be quite a job, although not impossible.
BTW, Although PySimpleGUI claims to be cross-GUI, in fact it only runs properly under tkinter. So, if we would have tkinter at our disposal under Pythonista, we could run PySimpleGUI as well. But, it's quite unlikely that we will ever see tkinter running under Pythonista or on an iPad in general (unless we get full Linux one day). Just dreaming ....

@cvp
Thanks.
I was already afraid of that.

I am developing a package which uses the excellent greenlet module (https://pypi.org/project/greenlet/).

Alas, this seems not to be supported by Pythonista.
Can we expect this to be included in a future version?

@lio418
https://github.com/ywangd/stash/issues/462#issuecomment-1472858042

@cvp
12 till 17 (including 13) causes crash here.

When I run this code

import inspect

class X:
    ...

sig = inspect.signature(X)

on Pythonista 3.4, a
ValueError : No signature for builtin <class 'object'>
exception is raised.

This did not happen on Pythonista 3.3 and not on a Windows machine running Python 3.10.4 (same version as Pythonista 3.4).
If I add an __init__ method, the exception is not raised anymore,

Of course, I can just use a try/except block to solve the problem, but it is very strange.

I ran into a bizarre bug with the latest version of Pythonista.
It took me quite a long time to discover the cause of a Pythonista crash.
Here's a MWE (minimal working example), showing the bug:

from PIL import ImageFont, Image, ImageDraw
font = ImageFont.truetype(font="calibri.ttf", size=15)
im = Image.new("RGBA", (100, 100), (0, 0, 0, 0))
draw = ImageDraw.Draw(im)
draw.text(xy=(0, 0), text="a", font=font)
print("never reached")

In this script, a text is written into a Pillow message.
When I run this, the system crashes and the crash log shows:

Fatal Python error: Aborted

Current thread 0x000000016d847000 (most recent call first):
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageFont.py", line 666 in getmask2
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageDraw.py", line 429 in draw_text
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageDraw.py", line 484 in text
  File "/private/var/mobile/Containers/Shared/AppGroup/11021B83-B419-4F67-A331-D54B9BAFC718/Pythonista3/Documents/salabim/a1_1.py", line 6 in <module>

Extension modules: pykit_io, _ui, _appex, _frameworksimporter, console, _debugger_ui (total: 6)

The strange thing is that this seems to happen only with this specific font (calibri.ttf) and only with font sizes between 13 and 17!
The code used to run fine on Python 3.3 and works well on all other platforms, I have used.

I found a workaround by using the Arial font instead of calibri.ttf. But it is very strange!

@cvp
Thanks for thinking with me.
I know how to add the Black section to pyproject.toml. Just can't work out where to put it in Pythonista to work with reformat.
Anyway, I've it working now via a user installation of Back.

@ccc
What do you mean with ruff.toml?
I tried pyproject.toml, but could get that working.