supercrooky posted:

Anyone have any suggestions for a memory efficient 2D array of ints with reasonable indexing speed? I've gone down the list of lists route (too much memory usage) and the numpy array route (slow indexing). My next thought is wrapping the builtin array object to have a 2D like interface.

supercrooky posted:

Anyone have any suggestions for a memory efficient 2D array of ints with reasonable indexing speed? I've gone down the list of lists route (too much memory usage) and the numpy array route (slow indexing). My next thought is wrapping the builtin array object to have a 2D like interface.

QuarkJets posted:

What's the actual problem that has led you to needing a 2D array with faster indexing?

Crosscontaminant posted:

I've used dicts with tuple keys before.

OnceIWasAnOstrich posted:

Dicts are usually not the answer to a question involving the words "memory-efficient".

OnceIWasAnOstrich posted:

I suppose that was so broad a statement as to be wrong. Dicts will be memory efficient for things hash tables are good for, although not especially so compared to other implementations you can use from libraries. The constantly doubling memory use usually bites me when I care about memory. In any case, for most dynamic programming algorithms including Smith-Waterman, the arrays won't be especially sparse.

EricBauman posted:

This is all somewhat babby's first python, but can someone tell me why

code:

import time
import urllib
countdown = 200

while countdown > 0 :
    for url in open('listoflinks.txt') :
        
       filename = str(countdown) + '.html'
       urllib.urlretrieve(url, filename)    
       
       time.sleep(3)
       countdown = countdown - 1
    print "This prints once every 3 seconds - ", countdown   

doesn't print that message and the countdown every three seconds?
I'm pretty sure I indented it all correctly.

vikingstrike posted:

The print statement is outside of the for loop, so it will only execute after every url in "listoflinks.txt" is done being processed. Indent the print line statement one more time if you want it to print after each url is processed.

EricBauman posted:

Now, a couple of minutes later, I've found out that it also doesn't stop at zero. It happily continues into negative numbers. I'll try to put some break things and other stuff like that in there.

FoiledAgain posted:

edit: Do you even need a while-loop? How many times are you going to loop through that list of urls anyway? If only once, you don't need the while.

EricBauman posted:

Hmm, I think i misinterpreted and misplanned something in my planning for this.
I wrote this a couple of weeks ago, then forgot about it because it didn't do what I wanted it to do.

Now, a couple of minutes later, I've found out that it also doesn't stop at zero. It happily continues into negative numbers. I'll try to put some break things and other stuff like that in there.

EricBauman posted:

Hmm, I think i misinterpreted and misplanned something in my planning for this.
I wrote this a couple of weeks ago, then forgot about it because it didn't do what I wanted it to do.

Now, a couple of minutes later, I've found out that it also doesn't stop at zero. It happily continues into negative numbers. I'll try to put some break things and other stuff like that in there.

ShadowHawk posted:

One possible source of your confusion is that while loops only check their condition when you get to the end of the loop (or start it for the first time) -- they don't continuously monitor the truthiness of their condition.

EricBauman posted:

Yeah, I think that's exactly what I was wrong about.

This whole project is so a colleague can just more or less automatically download the last X files from a list that automatically logs changed files. The sleep is to prevent the process from clogging up our unstable wireless. I could do it without the countdown and the while loop, but then I'd need to change the list to only contain X items, and since the list is also used by other people for other purposes (I imagined my colleague could copy it to the folder the files have to go in), that's not really a possibility.

Always fun, being the only non-techy team leader in an IT company and having to hack poo poo like this together together. Sure, I could ask a real programmer, but where's the fun in that?

Dren posted:

Is listoffiles.txt being appended to or prepended to?

Because if it's being appended to you're not getting the last 200 files, you're getting the first 200 files. You should also check if a file has already been downloaded before you download it.

And if you work with programmers isn't there one of them who would be willing to help you out instead of just writing it for you?

dirtycajun posted:

Fixed the problem with the Windows COM ports, still not entirely sure what caused it.

Ccs posted:

I'm just starting to learn Python to use in Maya and other CG programs to automate rigging and stuff like that. Python has started to make sense to me, and I'm learning the syntax okay, although a lot of the more abstract aspects of object oriented programming are still beyond my conceptual grasp.

One thing I don't get about python is why this works:

Python code:

def factorial(x):
    if x == 1:
       return 1
    else:
       return x * factorial (x-1)

That computes the factorial for numbers above 0, but I don't get why you can call the function inside of the function itself. It seems like that should cause a cycle error or something, what with the function depending on itself to produce the result. But it does work, so I'm not understanding something about how Python is structured.

Ccs posted:

Ccs posted:

I'm just starting to learn Python to use in Maya and other CG programs to automate rigging and stuff like that. Python has started to make sense to me, and I'm learning the syntax okay, although a lot of the more abstract aspects of object oriented programming are still beyond my conceptual grasp.

One thing I don't get about python is why this works:

Python code:

def factorial(x):
    if x == 1:
       return 1
    else:
       return x * factorial (x-1)

That computes the factorial for numbers above 0, but I don't get why you can call the function inside of the function itself. It seems like that should cause a cycle error or something, what with the function depending on itself to produce the result. But it does work, so I'm not understanding something about how Python is structured.

BabyFur Denny posted:

Wouldn't that function cause problems for any non-natural number?

Haystack posted:

Ok, so that sort of data mashing is not the sort of thing you want to be doing inside of your template (down that path lies php). Get your data into shape, then pass it into the template. In your case, you're basically mashing together two dicts, so here's an outline of what your code code might look like.

Python code:

 #If you want things to stay in some sort of order, use ordereddicts instead of plain dicts
value_map = {"unique_id" : "12345", "etc" : "etc"}
human_labels = get_human_lablels() #Your API call, deserialized into a {"value_map key":"human label"} dict

#There's shorter ways to do this mapping, but I left it long for readability
for_humans = {}
for key, value in value_map.iteritems():
    human_label = human_labels[key]
    for_humans[human_label] = value

#Now your template only needs to do a simple loop over the finalized data
template.render("my_template.jinja", values=for_humans))

Generally speaking, anything you pass into a template should already be finalized, or at worst have an API that resolves down to single calls.

quote:

site.ENABLE_USER_SITE
Flag showing the status of the user site-packages directory. True means that it is enabled and was added to sys.path. False means that it was disabled by user request (with -s or PYTHONNOUSERSITE). None means it was disabled for security reasons (mismatch between user or group id and effective id) or by an administrator.

Symbolic Butt posted:

It's a cool idea and I know you're just trying things out but I like SurgicalOntologist's version better. It's a little faster and more straightforward.