test.py failed on MacOSX

[iamyoukou]

The 13th line of test.py
show_image('img', img)
doesn't work. It never response.

When I comment out show_image('img', img), the program ends correctly.

Maybe there is something wrong with show_image?

[iamyoukou]

When I use

from PIL import Image
...
img = Image.open(tc.get_asset_path('textures/vegas.jpg'))
img.show()
...

instead of the original

...
img = tc.util.imread(tc.get_asset_path('textures/vegas.jpg'))
show_image('img', img)
...

the program executed correctly.

So I think there's something strange with show_image()

[yuanming-hu]

Thanks for the feedback. Do you mind providing more clues by showing on which python script it fails? On my Mac it works well thus I cannot reproduce this problem.

[iamyoukou]

Sorry, maybe it is get_asset_path()'s problem.
I tried print tc.get_asset_path('textures/vegas.jpg'), and it returns

And my ~/.bashrc is

The get_asset_path(path) function in python/taichi/misc/settings.py probably works differently on my MacOSX.

[yuanming-hu]

I think extra slashes will be ignored so it may not be the cause. You can try press Ctrl-C when it's blocked and paste the python call stack & error info here. Thanks.

[iamyoukou]

You're right, not the extra slashes problem.
And sorry, I don't know how to get python call stack & error info.
I googled and tried this
I tried

try:
    img = tc.util.imread(tc.get_asset_path('textures/vegas.jpg'))
except Exception:
    print(traceback.print_stack())

But it outputs nothing after I Ctrl-C (BTW, on my MacOSX, Ctrl+C doesn't work, but Ctrl+\ works)

[yuanming-hu]

Thanks for trying this. I guess it should be blocked in show_image where taichi.gui.tk.viewer.__init__ was called. You can try to add some prints and see where the script was blocked.

Sorry to get you so involved in this issue. Hopefull we can find something interesting and learn something.

[iamyoukou]

I can always learn new things when solving a problem and I'm happy with it, so don't worry about the "so-involved" thing.
And I found that the script is blocked at tk_root = tk.Tk()
in taichi.gui.tk.viewer.get_tk_root

[yuanming-hu]

Thanks. Then you can just open an interative python console, type

import Tkinter as tk
tk_root = tk.Tk()

and see if it blocks.

[iamyoukou]

Yeah, it blocks

[yuanming-hu]

Interesting... It seems a problem of Tk then.

[yuanming-hu]

On my Windows machine invoking Tk.tk() opens a window and returns. Did you see any window?

[iamyoukou]

No, nothing.
BTW, what will happen if you try the following code?

from Tkinter import *

root = Tk()
button = Button(root, text = 'Python/Tkinter')
button.pack()
root.mainloop()

[yuanming-hu]

I get a small window with a botton, as described by the code.

[iamyoukou]

And I get blocked... X_X

[yuanming-hu]

I googled about this problem yet found no similar result. What's the version of your TkinterYou can get it via

import Tkinter as tk
print tk.__version__

You may also want to check the version of Tk (Tkinter is it's python binding) installed by MacPort. Maybe it's too old and do not suit well with your OS X version.

[iamyoukou]

I got $Revision: 81008 $
And I just found there is a py27-tkinter on MacPorts, and I installed it.
But python2.7 keeps using the old version, not py27-tkinter

[yuanming-hu]

My revision is also $Revision: 81008 $. How about

print tk.TkVersion

? Mine is 8,5.

[iamyoukou]

Mine is 8.6

[yuanming-hu]

It sounds that nothing is wrong... The last thing I can help is to write a Kivy image viewer as an alternative to Tk, but it takes some time. If you can install OpenCV (cv2 in python), you can simply replace show_image('title', img) with cv2.imshow('title', img); cv2.waitKey(1) and you no longer need Tk to play with Taichi. Thanks.

[iamyoukou]

cv2.imshow('title', img)
cv2.waitKey(1)

works! I replaced the show_image('Vis', img) in mgpcg_smoke_3d.py, and I got correct output:

Thank you very much!

As for the Tkinter problem, I also posted it on [stackoverflow].(http://stackoverflow.com/questions/41544748/macosx-tkinter-no-response-when-tk?noredirect=1#comment70294395_41544748)
Can you put this issue open until there is a solution (probably)?

[yuanming-hu]

Cool. OpenCV was the original solution I took. I also do some computer vision research, but most people may not have it and installing OpenCV can be troublesome on Windows. So I added Kivy and @beaugunderson kindly added Tk.

@beaugunderson do you know how to deal with this Tk issue? Thanks.

[iamyoukou]

Found something weird.
I have two Python2.7 on my MacOSX.
One is python. It is pre-installed by MacOSX, and its version is 2.7.10.
The other one is python2.7. I installed it using MacPorts, and its version is 2.7.13.
For the code bellow

from Tkinter import *

root = Tk()
button = Button(root, text = 'Python/Tkinter')
button.pack()
root.mainloop()

When using python to execute it, I got correct output

When using python2.7, I got blocked

[yuanming-hu]

I also have two Pythons, pre-installed 2.7.10 and brew-installed 2.7.8. Both run Tk well, though. X_X

[beaugunderson]

Hmm, I have not seen this Tk issue either!

It sounds like you're saying the MacPorts python executable is using the system installation of Tk though... That sounds like it might cause the issue? But I'm not sure how to force python to use the MacPorts version...

[iamyoukou]

@beaugunderson I think python2.7(MacPorts) is using MacPorts-version Tk. I try the code bellow with both python(system) and python2.7(MacPorts)

import Tkinter as tk
print tk.TkVersion

and the output is 8.5(system) and 8.6(MacPorts).
So I think perhaps MacPorts python doesn't work well with MacPorts Tk.

[Archer-zty]

@yuanming-hu
Hi, I am new to python. There is a fooooolish problem when I running python test.py that makes me fell helpless...

test $python test.py
Traceback (most recent call last):
File "test.py", line 2, in
import taichi as tc
File "/usr/local/lib/python2.7/site-packages/taichi/init.py", line 1, in
from taichi.core import tc_core as core
ImportError: No module named core

I have installed taichi through pip

test $pip install taichi
Requirement already satisfied: taichi in /usr/local/lib/python2.7/site-packages

and the compilation for source code is successful

[1%] Linking CXX shared library ../build/libtaichi_core.dylib
[100%] Built target taichi_core

Thank you.

[yuanming-hu]

Did you use pip install taichi to get the python scripts? This may not work now. Please first 'pip uninstall taichi' and then follow https://github.com/yuanming-hu/taichi/wiki/Installation

After you add 'export PYTHONPATH=$TAICHI_ROOT_DIR/taichi/python/:$PYTHONPATH', python will find the python part of taichi automatically - no need for 'pip install taichi'.

[Archer-zty]

@yuanming-hu
I see. It works.
Thank you.

[yuanming-hu]

Visualization will be based on browser thereby tk will no longer be needed.