I am creating a GUI program using wxPython. I am also using matplotlib to graph some data. This data needs to be animated. To animate the data I am using the FuncAnimate function, which is part of the matplotlib package.
When I first started to write my code I was using a PC, running windows 7. I did my initial testing on this computer and everything was working fine. However my program needs to be cross platform. So I began to run some test using a Mac. This is where I began to encounter an error. As I explained before, in my code I have to animate some data. I programmed it such that the user has the ability to play and pause the animation. Now when the user pauses the animation I get the following error: AttributeError: 'FigureCanvasWxAgg' object has no attribute '_idletimer'. Now I find this to be very strange because like I said I ran this same code on a PC and never got this error.
I was wondering if anyone could explain to me what is meant by this _idletimer error and what are possible causes for this.
_idletimer is likely to be a private, possibly implementation specific member of one of the classes - since you do not include the code or context I can not tell you which.
In general anything that starts with an _ is private and if it is not your own, and specific to the local class, should not be used by your code as it may change or even disappear when you rely on it.
Related
Is there a way to exclude parameters being autocompleted in IntelliSense?
I have used IntelliJ before, and I recently switched over to VS Code. Upon switching and installing IntelliSense, I have had issues with some of the autocompletes. For example, on tab completion of the print function, I would just expect it to complete as:
print()
but it instead completes as:
print(sep=..., end=..., file=..., flush=...)
Only for some functions does the autocomplete include the parameter suggestions, and not for other, and I cant seem to figure out why. I tried looking through the settings but without much luck. Any help?
I am learning python using IPython. When I did something nice I like to copy this into some kind of private CheatSheet-file. Therefore I use the iPython %hist command. I am wondering, if there is a way to only print those commands which had been syntactically correct and did not raise an error. Any ideas?
Have you considered trying ipython notebook ? (I've used it on a couple of training courses)
You access the interatctive python via a web browser creating 'boxes' of runnable code. So if you ran a block, it gave the answer you wanted and threw no errors, you could then create another block and move on (preserving the bit you wished to keep). If it threw an error or didn't produce the expected result, you could edit and re-run until it did.
Your boxes of code can be interspersed with html markup notes, graphs, diagrams - you name it.
The whole notebook can then be saved for later access and re-run when re-loaded.
I have been fooling around for about a month with python now and something is bothering me.
I use the python(x,y) toolkit, which comes with the neat Spyder IDE.
My question concerns the UMD (User module deleter) of Spyder.
I found this graphics module on the internet, which helps one to do some simple graphic stuff in a python script (as far as I understand).
It is not like i'm stuck, but when I execute the folowing code:
import pylab as p
import graphics as g
window = g.GraphWin("tryout", 600, 600)
window.close()
print p.sqrt(4)
The output is:
>>>runfile(r'C:\some\folders\tryout.py', wdir=r'C:\some\folders')
>>>UMD has deleted: graphics
>>>2.0
line 1 is obviously o.k. and so is line 3, but I don't get line 2.
Also, the provoked window flashes in and out of the screen, as it should.
Line 2 doesn't seem to do any harm, and i can perfectly rerun the file as many times as I wan't, but I want to know where it is comming from.
AFAIK UMD forces the interpreter to reload a module everytime a script is run.
Does the displayed message mean that 'it' has deleted the references to the module, because it isn't used anymore, or is it something else? Or does it mean something is wrong, and will it 'hurt' my code should I add more afterwards?
Note: first question, so please comment the crap out of it to help me improve my asking skills.
EDIT: i tried shifting around the test line print p.sqrt(4), and found out that it doesn't matter where I put it. If its the first line after importing the modules, it still raisses the message before showing sqrt(4)
Short Answer:
Perhaps deleted is not the best word in the message you mention. It should be reloaded, which is what UMD is really doing and because is way less confusing. I'll fill an issue for this in our issue tracker.
Long answer:
UMD reloads not only your script but also all the local modules it depends on. By local I mean modules outside your Python installation and over which you have writing permissions.
The idea is that next to your script, perhaps you have developed a library of auxiliary functions to go with it. So you most probably want to reload that library too, so that any changes to it are reflected at run time.
I know this is not your case, so if you want to remove that message, you can go to:
Tools > Preferences > Console > Advanced settings > User Module Deleter
and deactivate the option
Show reloaded modules list
I find it hard to explain my problem as the problem is not within the code itself. If you need more input to understand the following better, please let me know.
I'm using ArcGIS to call a bunch of python scripts, one after another. The scripts use the same class by importing it, or inherit from it. To initialize the class I often use the same name. I have no idea how the communication between ArcGIS and python is implemented. But I noticed that my scripts are not always behaving like they should. I suppose that the reference to the object still exists (even though the script the object was created with has finished) when I call the second script.
First of all: How can I make sure my suspicion is true?
Secondly, if this is the case: is it a good idea to destroy all references to all objects using del or __del__? What is the best way to do this?
Trace tracing your code and walking through it with a debugger? Quickest way to tell if it's accessing correct code. Python Debugger
If you read the documentation, what you want to do is use a break point to make sure code reaches that point in code.
This is the syntax with the debugger.
b(reak) [[filename:]lineno | function[, condition]]
I'm coding using Python and Pyglet, and, as I just have starting the script, it is full of errors, which is normal.
What is less normal is that those errors don't stop execution of the script, even if they are 'basic python' errors. It isn't very bothersome, but a little, since it makes me outsee some errors.
For example, I got :
AttributeError: 'Win32EventLoop' object has no attribute '_next_idle_time'
(by the way, I don't know what this one means. It isn't the main subject of my thread but I'd gladly get answers for this one)
or :
IndexError: list index out of range
(A stupid bug I solved, but it should have stopped the script).
I use Eclipse + pydev, and never experienced that before. It may be pyglet related because it happened with my first pyglet attemps (before, I used pygame).
Thanks for answers,
Fred
Your GUI application is probably running in some kind of loop. This event loop is catching exceptions for You and printing them out.
I recommend writing Your code the way You can unit-test small parts of your program e.g. classes or functions outside of the framework and then glue them together as GUI application. This work-flow will guarantee that you haven't overseen simple bugs just because mindlessly throwing new code into more-or-less working pile of existing code ;)
Read about TDD ;)