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| 03:35.06 | flaco | hey all.. I have an wxpython windows app that uses storm, it works. but I'm creating an exe file and when I run the app it fails when storm try to import the sqlite module "InportError: No module named databases.sqlite" any ideas?? |
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| 20:41.41 | maxb | Is calling len() on a storm ResultSet a valid thing to do? |
| 20:42.49 | sidnei | maxb: you usually call .count() |
| 20:42.58 | jkakar | Yeah. |
| 20:43.13 | jkakar | Even better is to avoid COUNT and use EXISTS, but we don't have good support for that yet. |
| 20:43.41 | jkakar | Well, let me clarify, if you don't care about the count but only about the presence, or lack of, of rows, then EXISTS is better than COUNT. |
| 20:44.24 | maxb | I'm trying to convince Launchpad to run on Python 2.5, and I'm getting MemoryErrors. After poking around a bit, I've found they generally happen when someone calls list(storm_resultset) |
| 20:44.50 | maxb | I added a print of len(storm_resultset) and got 4294967295 |
| 20:45.13 | maxb | So my current working theory is that Python is trying to preallocate a 4 billion item list |
| 20:45.30 | sidnei | maxb: i would say you're on the right track |
| 20:46.18 | maxb | So... clearly the len result is nonsense - what behaviour would you expect len(storm_resultset) to have? |
| 20:48.53 | maxb | wonders where Python is getting that from in the first place |
| 20:49.32 | jkakar | maxb: Hmm, waitasec. |
| 20:50.23 | jkakar | maxb: Hmm, I didn't find what I was looking for... |
| 20:51.13 | jkakar | maxb: I was wondering if the SQLObject compatibility layer provided len(), but I don't see __len__ defined for anything in storm.*. |
| 20:51.24 | maxb | yeah, confusing |
| 20:51.30 | sidnei | i know the protocol for __len__ changed at some point, possibly in 2.5 |
| 20:53.11 | sidnei | maxb: are you running on x64 by any chance? |
| 20:53.20 | maxb | I am |
| 20:53.52 | sidnei | uhm |
| 20:53.54 | sidnei | http://docs.python.org/c-api/object.html#PyObject_Length |
| 20:53.59 | sidnei | Changed in version 2.5: These functions returned an int type. This might require changes in your code for properly supporting 64-bit systems. |
| 20:55.14 | maxb | hmm |
| 20:56.17 | maxb | I called repr on an object and it claimed to be a storm.store.ResultSet, then I called len on it and it said 2**32 |
| 20:56.39 | maxb | I wonder if repr can lie |
| 20:56.57 | sidnei | maxb: if the object is proxied, maybe. |
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| 20:58.30 | maxb | Sounds entirely feasible |
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