Mailman 3 February 2012 - yt-dev

strict and unstrict regions, periodic regions
by Matthew Turk 03 Feb '12

03 Feb '12

HI all, Can someone remind me why we need the strict and unstrict region objects? The strict ones select by cell center, the unstrict by any intersection. I seem to recall a concrete use case but I can't dredge it up. Additionally, if we are actually checking for periodicity, it seems to me we have no need for non-periodic regions, right? We just coalesce into a single rectangular prism object that, if appropriate for the simulation, wraps around? -Matt

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PEP8
by Stephen Skory 02 Feb '12

02 Feb '12

Hi all, while vegging out in front of the TV, I've been playing with a pep8 checker (http://pypi.python.org/pypi/pep8), and I get the statistics below for all the *.py files in yt. How much do we care about this stuff? There are automatic tools (http://pypi.python.org/pypi/autopep8/0.3) but I don't know if we can trust them. Thoughts? (the first column is the number of incidents) 70 E101 indentation contains mixed spaces and tabs 76 E111 indentation is not a multiple of four 605 E201 whitespace after '[' 68 E202 whitespace before ')' 94 E203 whitespace before ',' 105 E211 whitespace before '[' 191 E221 multiple spaces before operator 57 E222 multiple spaces after operator 3769 E225 missing whitespace around operator 4271 E231 missing whitespace after ',' 1080 E251 no spaces around keyword / parameter equals 986 E261 at least two spaces before inline comment 6 E262 inline comment should start with '# ' 414 E301 expected 1 blank line, found 0 2061 E302 expected 2 blank lines, found 1 369 E303 too many blank lines (2) 168 E401 multiple imports on one line 4644 E501 line too long (80 characters) 1760 E701 multiple statements on one line (colon) 276 E702 multiple statements on one line (semicolon) 70 W191 indentation contains tabs 1585 W291 trailing whitespace 3 W292 no newline at end of file 3163 W293 blank line contains whitespace 221 W391 blank line at end of file 197 W601 .has_key() is deprecated, use 'in' 17 W602 deprecated form of raising exception -- Stephen Skory s(a)skory.us http://stephenskory.com/ 510.621.3687 (google voice)

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Boundary Conditions
by Matthew Turk 02 Feb '12

02 Feb '12

Hi all, What's the best way to handle boundary conditions? I was thinking mainly, what's the smallest signal we can send -- typically into Cython routines that might need to iterate -- that indicates, "wrap this around the edge in this dimension"? Essentially I think there are two main cases we need to consider for the purposes of what yt wants, which are: 1) Periodic along an axis 2) Non-periodic (inflow, isolated) on an axis This shows up for the plotting routines, vertex-centering of data, and a handful of other things. I'm not sure how to handle this the best. If we really have only these options (and I'm not a 100% on that) then would it work to have a simple array of axes that hangs off the hierarchy object, which is 0 for non-periodic on an axis and 1 for periodic? -Matt

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Call for testing: SHA512 in the install_script instead of md5 on the server
by Matthew Turk 01 Feb '12

01 Feb '12

Hi all, Currently to verify file integrity with the install script we download sidecar md5 file from yt-project.org. These aren't versioned, and md5 itself is largely deprecated for this. I've created a new sha512-using version of the install script, which uses sha512 hashes stored *in the install script* to verify file integrity. This way any time these change we will be notified of them. I'd like it if a few people could test this -- I have -- on pristine systems. It changes both how the files are downloaded and it now uses sha512sum, which should be available on most systems (according to Kacper :). You can do this by: wget https://bitbucket.org/MatthewTurk/yt/raw/367ea3bfff2e/doc/install_script.sh and then running it, but maybe supplying an alternate directory rather than the default. Thanks for any feedback. -Matt

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