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Is there a way to debug a python script using the python4delphi components?

I want to add scripting capabilities to my application and I just came across python4delphi http://code.google.com/p/python4delphi/, which seems to be stable.
At first sight it looks very easy to use on the developers side, but I couldn't find a way to debug a script. Would be great if I could embed the IDLE IDE in my application, I just have no idea how to do it.
Is there a easy way to add debugging capabilities with python4delphi? Should I use other script engines like pascalScript (seems to have been discontinued)?
Edit: After having a look at PySctipt and pdb I realized that what I am looking is more like a visual editor with embedded debugging and the capability to read python4delphi custom modules (the ones where I export my delphi objects. Being a python noob I have no idea how p4d does this). I am probably asking too much, but would be great to find an implementation of that and not having to code it all from scratch.

Python is really a great language.
But if you need to embed script, with debug, in a Delphi application you should considere Pascal scripting, which is more available in Delphi.
I use the excellent PascalScipt, in the exemples you will see editor, debugger and a lot of other functions.

Looking for a Python editor that will let me collapse functions

I really loved this feature when I used Eclipse for Java programming, but I can't find the same functionality for a Python editor. IDLE and Pyscripter are nice, but they don't help in this area.
Basically, I just want the option to collapse or otherwise hide functions that I don't feel like looking at for a while. Know of anything like this?

In addition to the aforementioned (great) editors, you might want to give PyDev a shot as well.

Geany can do this.

Notepad++ has this feature.

Komodo Edit IDE, for Windows, Mac and Linux, for Python, PHP, Ruby, JavaScript, Perl and Web Dev.

I've used Komodo Edit and Notepad++ in the past but my current preference is Sublime Text Edit 2.
Although not free (and actually quite expensive), it can be used in free mode with only an occasional reminder and no other restrictions.
It is actually written in Python so you get a Python console built in - you can also get other consoles such as JavaScript. It is VERY flexible & has some very good features. It is also has an excellent community with loads of very useful plugins.
It is much lighter on resource usage than Komodo, can use Textmate bundles directly (so gets loads of formatting options for different file types). It is cross-platform and doesn't even need installation on Windows.

Pycharm CE, from Jet Brains, indeed, wonderful. Functions and comments collapse is ready out of the box, as well as edit helpers. Project files and assets organization, integrated python console, powerful debugging tools,... Then, lots of plugins: git integration, tinycode view, extra languages' helpers and highlighters,.... anything you need when coding, but simple and easy to use. There's a Pro (paid) version for those who want even more.
https://www.jetbrains.com/pycharm/download
(This question is more than 10 years old. I got surprised, nobody answered about Pycharm before...)

Python IDE with auto completion

please advise me some good Python IDE, I was using netbeans but it does not have suitable code completion (when I press "." it gives me methods of all classes of python. It would be nice if netbeans would work as for ex. for PHP..
Thank you.

Eclipse with Pydev
nothing better out there

Pytools should add intellisense for python to visual studio if you are developing on windows. I have not tried it myself so I don't know how good it works.

I have also been searching for a good IDE for Python development. I tried using Emacs and Komodo but finally settled for PyCharm. It does a really good job at auto completing the code and I find it to be worth the money.
Depending on the type of development you do, you could get a discounted or even a free license.

well, many IDEs now come with pretty good code completion. Eclipse with pydev is nice, or you can get aptana studio 3 to perform similar to it.
Theres also jetbrain's PyCharm, if you don't mind paying for a licence (they do give a trial version too if you want to test it before buying). There are a lot of such IDEs, guess you have to try them out to see which suits your code completion tastes better.

Try Geany and Ctrl+Enter. Foo bar <= wrote this because SO said answer was to short ;)

PyCharm for pay or Komodo Edit for free.

Komodo has since long time an excellent Python support

I found the below links very helpful in deciding the python IDE. They provide a lot of insight into the features with respect to all the relevant IDEs. It looks like most of them have auto-code completion feature as per these links. Since I have been using eclipse and VS Code all my life, I stick with Pydev or VS Code, yes will need some plugins to install. Pycharm has lot of features, if you can afford paying some money. I also found intelliJ also supports a lot of features.
What IDE to use for Python?
https://wiki.python.org/moin/IntegratedDevelopmentEnvironments

Autocompletion in dynamic language IDEs, specifically Python in PyDev

I'm new to Python, with a background in statically typed languages including lots and lots of Java.
I decided on PyDev in eclipse as an IDE after checking features/popularity etc.
I was stunned that auto-complete doesn't seem to work properly for builtins. For example if I try automcomplete on datafile after:
datafile = open(directory+"/"+account, 'r')
datafile.
No useful methods are suggested (e.g. realines). Only things like call.
I am used to learning a language by jumping into class definitions and using lots of auto-complete to quickly view what a class will do. My PyDev 'interpreter' is set up fine with 'forced builtins'.
Is it possible to get auto-complete for builtins with PyDev? Am I approaching the IDE wrong, i.e. should have an interpreter running on the side and test stuff with it? So far the IDEs have seemed weak, e.g. IDLE segfaulted on my new mac after 2 minutes. I'd love to know what experienced Python developers do when exploring unfamiliar (builtin) modules, as this is making me reconsider my initial attraction to Python. I like a language you can learn by easy exploration!
Thanks,

In my opinion, the Python shell is a much better place to explore new modules than relying on an IDE. Don't forget, in Python you can do anything in the shell that you can do in a program, because there's no separate compilation step. And in the shell, you can use dir(x) to find all the properties and methods of x, whether x is a module, a class, or whatever.
Even better, the enhanced iPython shell does provide tab completion for all objects.
In fact because of this, many Python programmers - myself included - don't use an IDE at all, but just a simple text editor (I use VIM).

Just to keep it up to date so that new readers are not confused about the current state of Pydev - the example you gave now works in Pydev. (btw, one should avoid operating on paths manualy - use os.path.join instead)

I'd love to know what experienced
Python developers do when exploring
unfamiliar (builtin) modules
I use ipython. Ipython is an enhanced version of the interactive shell that adds tab completion and quick access to an object's doctstring. It also gives lots of other features that the standard shell does not have - you can find a summary of its features here.

Someone more knowledgeable here can give you a detailed answer. Here is a short one.
Autocomplete for a dynamically typed language can by nature never be as rich as that for a statically typed language. In the case of open for instance there is no way to figure out what will be the return type at the time of writing the code. The method signature does not include a return type unlike a statically typed language like Java. Consequently the IDE is not able to give you any hints.
You certainly should have an REPL running during any Python development. One advantage of an interpreted language is that you can test small chunks of your code on the REPL as you go along. It is also a good place to test your understanding of how built-ins and other modules work.
I work on Ubuntu so I do not know how easy or difficult it is to get IDLE running on a Mac. I usually work with the very handy iPython for REPL needs and use Pydev for other development (such as Django). You might want to give iPython a try.

You want IPython. As Daniel pointed out above, the interactive shell is a much better way to explore Python (and indeed, most other languages too).
This might help with setting it up on OSX.

You might want to take a look at WingIDE. It autocompletes your datafile correctly.
If it is unable to infer the type, you can use an assert like
assert isinstance(datafile, file)
to help the autocompleter out

I use PyDev at work so I know where you're coming from. If you're willing to consider other tools, have a look at JetBrains' PyCharm, that's my new preferred Python IDE for my own projects. No affiliation to speak of except to say I'll be picking it up when it's out of beta. :)

All in one Django/Python editor

I know this is probably a question that is asked a ton on here but I haven't been able to find exactly what I'm looking for. I'm a JAVA developer that is learning Python and Django and I'm looking for a good development environment. I would like to be able to edit python code, css, html and javascript all in the same editor if possible. I have been trying out both Komodo and pydev. I like Komodo so far. Being a JAVA developer I am very comfortable in Eclipse but it just doesn't feel like it might be the right environment to be doing Python development in. I was wondering if anyone had good recommendations. I also have heard about CODA, TextMate and SubEthaEdit. I should mention that I'm doing my development work on Mac. I know these things are really opinionated but didn't know if there was some kind of "industry" standard for Python/Django development on the Mac.
I have done the normal searches on stackoverflow and looked through this post as well What IDE to use for Python?. I just haven't found an answer that seemed to fit my situation......

If your familiar with eclipse, by all means try Pydev first. I was the opposite, I was/am a Python developer who switched to Java. There was no real difference between using Eclipse for Java and Eclipse for Python (Pydev), you still get inline docs, debugging, code completion, the whole bit. You also get a lot of great stuff along with it like subversive, mylyn, aptana, etc.

As you're familiar with Eclipse, Pydev is a good choice.
Komodo is the only IDE/Editor I know which supports Django Template Language syntax highlighting. But it's really so rudimentary that I think you can live without it.

A lot of Mac developers use TextMate because it has a lot of creature features.
If you're working with big files and need speed, look at BBEdit - it's amazing how fast it can find/replace stuff.
If you want an editor that is close to Eclipse, but not a full-blown Java-based/oriented IDE, Komodo Edit (open source) or IDE (commercial) is pretty good, though I can usually get it to crash within an hour. I think it doesn't like me.
My primary editor is vim or gvim, depending on what hosting system I am on. It handles every language, runs on Mac, Linux and Windows, and is very customizable and, when you're used to it, can be very fast. I spend 99% of my editing time in gvim and it's the first or second thing I install on a machine, along with my customized setup and favorite fonts and plugins.

I'm on OSX and I've recently tried out http://www.jetbrains.com/pycharm/ and it looks pretty good, but I can't quite get comfy with it -- but if you're familiar with Eclipse, then you might like it.
Personally, I find that I'm plenty productive with TextMate and a few of the Textmate Python/Django bundles

I think you should give Geany a try. Its very easy to use and is definitely one of my most favorite IDE's I have ever used.