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matplotlib interactive alteration of line properties

I've been looking for a graphical / ipython console based means to turn lines on and off in a 2D graph generated with matplotlib, but I haven't found anything thus far.
Does anyone know a way to do something like this? What I have in mind specifically is incorporated in MATLAB, and can be seen here:
http://matlab.izmiran.ru/help/techdoc/creating_plots/plot_to5.html
All of the check boxes in the plot browser window will turn the lines on and off; their properties can also be altered graphically in another dialogue box. For now, I've been clicking on the properties button, and setting linetype to none, but this is cumbersome for a graph with many lines...

Thanks Vadim for your answer - you're right that the widgets provide an example with this functionality - to an extent. The example you provide doesn't give the graphical feedback I had in mind; instead, the widgets example closest to my request is actually check_buttons.py (see: http://matplotlib.org/examples/widgets/check_buttons.html)
Here, a side-box of labelled check buttons can be created, where upon clicking the checked buttons, it will turn the lines on and off - see the figure below. I suppose this could be built up into something along the lines of a plot browser like in matlab, but would require additional work to incorporate simple changes to the line style, etc.
I am still interested to know if someone has already done all of the work in making such functionality available; if not, I will post my best attempt when I get around to it.
plot_browser
I don't have sufficient rep points to add the image inline; my apologies.

Yes, there exists module named matplotlib.widgets. There are some example here. It allows you to do exactly what you asked for (source):

Adding wxPython GUI elements in a pygame physics simulation

I have made a pygame physics simulation--'a projectile motion' but it lacks interactivity like accepting angle of launch,speed etc. I am wanting to add input boxes with increase decrease arrows but don't know how to go about it. Thanks for the help.

Maybe you can try PGU (Phil's pyGame Utilities).
In addition to other tools, it has a library for creating GUIs.
This PGU demo shows probably something similar to that you are looking for:

Try Some of these:
http://wiki.wxpython.org/IntegratingPyGame
http://www.pygame.org/project-Pygame+embedded+in+wxPython-1580-2788.html
Good luck!

I don't think trying to add wx-Elements is a very pygame way of implementing a GUI, a better (in sense of portable) way would be to use some all-in-python-GUI-extention for pygame. But the issue of GUI in pygame is anoying, since I could not find any library that offeres such a thing.
I know of two interesting approches, first there is Albow (a little bit of widgetry for pygame), which has a nice implementation of styles. The newest Version (which is not very new, I'm afraid) can be found at http://www.cosc.canterbury.ac.nz/greg.ewing/python/Albow/
Then there is OcempGUI http://ocemp.sourceforge.net/gui.html -- which has documentation and an some good concepts of event handling.
The sad thing is, both projects seem to be dead. I know of no other pygame-GUI that is worth looking at (correct my on that one, please!). For my own project I started to build something inspired by both of them (just don't expect that to ever become useable), since I'm not really content with either of the two. But they might by just the thing if you don't want to put too much time into it and want to have a good collection of GUI elements from labels and buttons up to file browsing dialogs or scrollable text fields.

Picking a suitable GUI framework for project

I have a project where I have to show some sort of changing bar graph with results from a function. This bar graph should be in colour and 3d. I want it to look good since it's an open source educational program where it teaches the user about different voting systems and how they effect the outcome of an election. I would like to use python but I have no idea about using GUI frameworks since all my work in python has been command line based. Your help will be appreciated.

For 3D graphics, you might want to use OpenGL with a game framework, such as PyGame or Pyglet. Use matplotlib as TJD suggested in the other answer.
As for GUI frameworks, they generally won't help much with 3D graphics:
PyQt is one choice; I see you already have it in the question tags. PySide is very similar to PyQt, but with a nicer licence.
Then there's tkinter (in the standard library), wxPython, and pyGTK – I hear all of them are good, though I don't know them personally.
Pick one and stay with it. It'll take some time to learn if you're not experienced, so don't expect results too soon.

You might want to look at matplotlib, which is probably the most widely used library for doing graphs, including 3-D.

Is there any good python library for generating and rendering text in image format?

I'm developing a CMS like application where the user should be able to create the menu the way he wants. Ideally, each menu object wouldn't be a text with a background but rather an image of the text. I envision this in either of these 2 ways:
a) By rendering a font in a/several image file/s with every letter and a script that given a word would give me either the sequence of images to string together or a single image file with the combination of all letters. I understand this could be done manually, but I feel there's probably a library to help with this.
b) With some kind of imaging library that would be able to render text with several blending effects such as gradient color, shadows, glow, etc. While I believe this one's a bit harder, maybe there's something that suits this need.
Any tips on any library that does this or anything similar?
Thanks in advance!
Bruno

We are using Imagemagick.
http://www.imagemagick.org/Usage/text/#attributes
This will render a simple button with text:
convert -background white -fill dodgerblue -font Candice -strokewidth 2 -stroke blue -undercolor lightblue -size 165x70 -gravity center label:Anthony label_color.gif
Wrapping this into a Python module is straight forward.

Although nowadays I'd settle to go with web fonts and CSS,a couple of years ago I faced this problem, and put together a small project that would generate text-within a templated image on the file, according to passed URL parameters.
The project is still publicized here: https://bitbucket.org/jsbueno/dynabutton -- it is made to work as a CGI script, but could be easily adapted to work with a more eficient server (I'd recomend some security tunning as well, if you are putting it online). You can also use it to generate all your images with a server side script, and just put the resulting image files online.
(it does use PIL underneath)
Ah yes, it can do shadow, and glow with proper parameters, can use any server-installed font, and will use an image template for providing the background, so you can apply any effect manually. (the included temlates, though, are quite amateurish)

Check out pycairo, bindings for the cairo rendering package. It can render text as well as graphics.

Well, with modern CSS techniques, the issue of nonmatching client-side fonts is less of a problem these days. Still there's demand for text-to-image tools.
PIL is often given as the answer to this question, but personally, I would give a good, hard look at pythonmagick as well. Pick the one that works best for you.

Actually the pygtk also has a pango renderer, as well.

How to make PowerBuilder UI testing application?

I'm not familiar with PowerBuilder but I have a task to create Automatic UI Test Application for PB. We've decided to do it in Python with pywinauto and iaccesible libraries. The problem is that some UI elements like newly added lists record can not be accesed from it (even inspect32 can't get it).
Any ideas how to reach this elements and make them testable?

I'm experimenting with code for a tool for automating PowerBuilder-based GUIs as well. From what I can see, your best bet would be to use the PowerBuilder Native Interface (PBNI), and call PowerScript code from within your NVO.
If you like, feel free to send me an email (see my profile for my email address), I'd be interested in exchanging ideas about how to do this.

I didn't use PowerBuilder for a while but I guess that the problem that you are trying to solve is similar to the one I am trying to address for people making projects with SCADA systems like Wonderware Intouch.
The problem with such an application is that there is no API to get or set the value of a control. So a pywinauto approach can't work.
I've made a small tool to simulate the user events and to get the results from a screencapture. I am usig PIL and pytesser ORM for the analysis of the screen captures. It is not the easiest way but it works OK.
The tool is open-source and free of charge and can be downloaded from my website (Sorry in french). You just need an account but it's free as well. Just ask.
If you can read french, here is one article about testing Intouch-based applications
Sorry for the self promotion, but I was facing a similar problem with no solution so I've written my own. Anyway, that's free and open-source...

I've seen in AutomatedQa support that they a recipe recommending using msaa and setting some properties on the controls. I do not know if it works.

If you are testing DataWindows (the class is pbdwxxx, e.g. pbdw110) you will have to use a combination of clicking at specific coordinates and sending Tab keys to get to the control you want. Of course you can also send up and down arrow keys to move among rows. The easiest thing to do is to start with a normal control like an SLE and tab into the DataWindow. The problem is that the DataWindow is essentially just an image. There is no control for a given field until you move the focus there by clicking or tabbing. I've also found that the DataWindow's iAccessible interface is a bit strange. If you ask the DataWindow for the object with focus, you don't get the right answer. If you enumerate through all of the children you can find the one that has focus. If you can modify the source I also advise that you set AccessibleName for your DataWindow controls, otherwise you probably won't be able to identify the controls except by position (by DataWindow controls I mean the ones inside the DataWindow, not the DataWindow itself). If it's an MDI application, you may also find it useful to locate the MicroHelp window (class fnhelpxxx, e.g. fnhelp110, find from the main application window) to help determine your current context.
Edited to add:
Sikuli looks very promising for testing PowerBuilder. It works by recognizing objects on the screen from a saved fragment of screenshot. That is, you take a screenshot of the part of the screen you want it to find.