I hope Notch decides to tweak the default trees a bit, I'd love to see anything like this officially in the game and ready to deploy at the press of a button. Treehouses, dark forests... it just adds so much.
It did the same for me. I just put the script where my .mclevels were and it worked. Which would be in your Application Data folder and in .minecraft . If you save them to the default place, that is.
Yeah, mine's in there with the saves.
I've named everything correctly and double checked my settings. Everything's fine from what I can tell.
I tried to get a screen shot of the box, but it disappears way too fast.
The install of Python usually comes with a copy of IDLE. Open the script in IDLE and run it from there. The error should stay up in the IDLE screen. Copy the error text (or just post a screenshot) to the thread and I'll see what I can do.
Short answer, I don't think weeping willows are going to work unless Notch changes the way trees are made. I'll take a look at the swamp idea. Are you thinking "rainforest" style trees, only in water?
The long answer about weeping willows. Hanging foliage does not currently work because foliage blocks despawn unless one or more of the following is true:
1. The foliage block is supported by another block
2. There is a "log" block within two squares of the foliage block at the same height, or at the height below.
Thus you can imagine, long hanging strands of foliage would (without very close proximity to a trunk or branch) disintegrate from the bottom up. This could be worked around by having a "log" block at the bottom of every hanging strand, but I think this would make the willows look weird. Looking good is the main point of this script, so I'm holding off on weeping willows for now.
More importantly, I'm waiting to hear back from Notch about integrating the script into vanilla minecraft. If he wants to, then we won't need the script any more (whenever he gets to coding trees), and a lot of the work-arounds I've been using will become moot. If not, then I'll keep working on the script. Development is at a standstill at the moment, though I'm working on the city infrastructure script right now.
Ah, now that I think about it it does seem a bit improbable.
For the swamp = rainforest in water idea, I think that Swamp trees are slightly different from that of Rainforest trees. They seem to be more of a skinnier version of the tree on the left of this image. By skinnier, I mean small trunk size (one to two logs wide) and less dense foliage spaced farther apart up and down the main trunk.