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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: L-system equations drawing tool
Date: Fri, 18 Jul 2014 19:11:02 -0400
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On 7/17/2014 5:38 PM, Ya=C5=9Far Arabac=C4=B1 wrote:
> Hi,
>
> I wrote a small program to draw L-system equations using tkinter. You
> can find it on https://github.com/yasar11732/tklsystem
>
> It is still under development, but seems to be working nice so far. I
> could only try it on windows, but it should work on Linux too.
>
> You will need Python 3.x to run it. PIL/Pillow is optional but highly
> recommended. It allows faster rendering and ability to save images.
>
> You can also save your equations and load them later.
>
> Try it and comment it if you are interested. Bug reports and
> contributions are also welcome.

As near as I can tell, this is a collection of modules rather than a=20
package. This means that for imports like these to work:

from l_system_utils import cached_expand_string
from lsturtle import Turtle

the containing directory must be added to the search path, as is done by =

running from within the directory. That is ok for now and what I will try=
=2E


However, if your repository were a package, lsystem, with a blank=20
__init__.py and __main__.py containing

from lsystem import main
main.main()

and main.py contained an expanded version of the current ending

def main():
     root =3D tk.Tk()
     app =3D Main(root)
     root.bind("<Return>", lambda _: app.render_image())
     app.run()

if __name__ =3D=3D "__main__":
     main()

and the module names prefixed wither either 'lsystem/' or './' (for=20
relative imports)

and the package were installed in lib/site-packages, it would then run=20
with pythonw -m lsystem (or pyw -3 -m lsystem, I believe)

pip (at least by default) installs packages in site-packages. It will=20
also add a file to /scripts though I don't know the setup to do that.
-----------------------

Copying the examples directory withing the non-package directory to my=20
home directory with this

         self.lsf_dir =3D expanduser(join("~", "lsf-files"))
         if not isdir(self.lsf_dir):
             from shutil import copytree
             from os.path import dirname
             examples =3D join(dirname(__file__), "examples")
             copytree(examples, self.lsf_dir)

means that deleting the directory will not remove everything. Not nice.=20
Also unnecessary. Regardless of where you save, read them from the=20
original directory.

Actually, the files are so small, that you could instead make them=20
entries in one examples.cfg file, much like Idle does with extensions=20
(for instance) using configparser.ConfigParser.  You could then save to=20
a single user.cfg file.  Example entry:

[dragon curve]
iterations=3D 12
angle=3D 90
axiom=3D FX
rule1=3D X:X+YF+
rule2=3D Y:-FX-Y
rule3=3D
rule4=3D
constants=3D

-------
If I hit 'load', the file dialog opens in idlelib.
If I hit [cancel], I get an error, probably from trying to open None.
Traceback (most recent call last):
   File "C:\Programs\Python34\lib\tkinter\__init__.py", line 1487, in=20
__call__
     return self.func(*args)
   File "main.pyw", line 248, in load_from_file
     with open(fname, "r") as f:
FileNotFoundError: [Errno 2] No such file or directory: ''


--=20
Terry Jan Reedy