This is my first post on stack overflow so I hope I'm doing it properly.
I am currently working on a Terminal User Interface for python applications. I know that there are many ready-to-use libraries such as npyscreen out there, but I wantend to create one as programming excercice. In particular, I wanted to to play with some architectural patterns to learn them.
All that said, I'm currently facing several problems with python curses library, that I'm using as low level interface to the terminal.
The problems arise when I try to resize my terminal. As you can see from the code (see below), I handle the terminal resizing in the main loop, invoking the getmaxyx()() method of my curses window and redrawing what is on the screen accordingly.
The problem is that the screen seems to flicker when I try to resize the terminal.
Moreover, my "curses application" works fine on MacOS but totally crashes on windows (even after installing windows curses).
To handle that I tried to re-write the low-level interfice by using the blessed library. It solved the windows crashing problem, but the flickering still remains.
I can not figure out what the problem is.
Fore those wishing to help me, here follows the github page of the project: Terminal GUI on GitHub
Thank you in advance.
With curses, there's (at least) 3 things to look for:
ncurses can handle SIGWINCH (PDCurses may not)
some Python configurations interfere with ncurses receiving SIGWINCH. If your program never receives KEY_RESIZE (which it's not checking for...), then it's time to file a bug report for Python to get that fixed.
some programs don't actively read keyboard input (and if KEY_RESIZE isn't read, ncurses won't update the screensize. That would make the program crash.
Related
I tried to open a file, the filename is 1.txt. I tried to open it with webbrowser.open("1.txt") or os.startfile("1.txt") which worked perfectly fine, but I couldn't find any information about how to start programs or anything with Python in full screen. I'm using Linux and Python 3.6.
Any ideas how to perform something like that?
There are more answers to that question than there are GUI toolkits, and there are plenty of toolkits.
I think the first thing you need to do is decide on a GUI toolkit. Research it depending on your necessities (python version, OS support, etc). Once you settle on one, find out how to make a fullscreen app with that. If you can't, ask again.
Good luck.
I want to enable use of PyQT gestures in my application. Anybody has an example or some short code that could demonstrate use of gesture control in PyQT application?
I tried googling around but could find only one post about customizing the gesture... I am not that far yet at all, I just want to see how to bind the gesture and callback in Python QT app.
thanks
I'm working the same problem. No reason why it shouldn't work, by simply translating some of the C++ examples, but its bleeding edge.
For example, won't work on Linux desktop (just Windows) without Qt 5 or a lot of work. See http://qt-project.org/forums/viewthread/12664. If I get Qt 5 installed, I hope to post a Python example.
I am using PySide, and the QtGraphicsFramework and have a small test program. Another more sophisticated test, of custom gestures, is crashing, not just throwing exceptions, and I'm suspecting the Python binding.
There are plenty of nuances. If any platform is good for learning, it should be Qt and Python. Go figure why there are no examples yet.
I am running a stand-alone Python v3.2.2/Tkinter program on Windows, not calling any external libraries. Idle has been very helpful in reporting exceptions, and the program has been debugged to the point where none are reported. However, the python interpreter does occasionally crash at non-deterministic times - operations will run fine for a while and then suddenly hang. The crash triggers the standard Windows non-responding process dialog asking if I want to send a crash dump to Microsoft:
"pythonw.exe has encountered a problem and needs to close.
We are sorry for the inconvenience."
Crash reporting in Python says that the interpreter itself rarely crashes. My question is: no matter how many mistakes there are in a python script, is there any way it should in theory be able to crash the interpreter? Since there are no exceptions being reported and the crashes happen at random times, it's hard to narrow down. But if the interpreter is in theory supposed to be crash-proof, then something I'm doing is triggering a bug.
The code (a scrolling strip-chart demonstration) is posted at What is the best real time plotting widget for wxPython?. It has 3 buttons - Run, Stop, Reset. To cause a crash just press the buttons in random order for a minute or so. With no interaction, the demo will run forever without crashing.
Of course, the goal is for something like Python to never crash. Alas, we live in an imperfect world. A more useful question to ask, I think, is "What should I do if Python crashes?". If you want to help make a more perfect world, first make a quick search at the Python issue tracker to see if a similar problem has already been reported and possibly fixed in a newer or as yet unreleased version of Python. If not, see if you can find a way to reproduce the problem with clear directions about steps involved, what OS platform and version, what versions of Python and 3rd-party libraries, as applicable. Then open a new issue with all the details. Keep in mind that Python, like many open source projects, is an all-volunteer project so there can be no guarantee when or if the problem will be more deeply investigated or solved (most issues are resolved eventually) but you can be happy that you have done your part and likely saved someone (maybe many people) time and trouble. If you want other opinions before opening an issue, you could ask about it on the python-list mailing list/news group.
Python isn't indeed 100% crash proof, especially when you using external libraries, which TkInter is.
There is even page dedicated to it: http://wiki.python.org/moin/CrashingPython
I wrote an applet in Python using the Tkinter library. I finished writing the applet but now I want to make it public on my website. Does anyone know a way to get the python script to work on my website? I don't want it to have to be something that needs to be downloaded, but can just run in the browser if possible.
Thanks!
What you ask is not possible. Several years ago there was a Tcl/Tk browser plugin, but the last time anyone touched that sourceforge project was back in 2006. I seriously doubt it could be made to work with tkinter. For that matter, I doubt it works for tcl/tk either. Browsers have advanced quite a bit since then.
And no, getting it to work in jython so you can run it via a java plugin won't help. Tkinter works by working directly with a tcl/tk interpreter. The tcl/tk interpreter won't run in the JVM.
I'm developing an application with PyGTK that will make use of visual-python's 3d drawings and animations, but I can't get both libraries to work together: they either hung up when I close the Gtk window or they get stuck when I run the application.
I've tried with threads and they run side-by-side, but when I close visual-python's window this kills python's interpreter, raising a Segmentation Fault.
Has anyone been able to use visual-python from a PyGtk app?
This is a non-trivial problem given the way that VPython wants to work, but there is an example in the contributed programs section of the VPython web site that shows how to embed VPython into a wxPython application, so perhaps you can look over that code and determine what you would need to do to perform the same magic in PyGTK.