some python resources

01Nov11

python tutorial:
http://docs.python.org/tutorial/
numpy tutorial [arrays]:
http://www.scipy.org/Tentative_NumPy_Tutorial
plotting tutorial:
http://matplotlib.sourceforge.net/users/pyplot_tutorial.html

free online books:
http://diveintopython.org/toc/index.html
http://www.ibiblio.org/swaroopch/byteofpython/read/

install enthought python:
http://www.enthought.com/products/edudownload.php

video tut:

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Tags: python

cfitsio wrapper in python

21Jun11

After several issues with pyfits, and tired of it being so overengineered, I’ve wrote my own fits I/O package in python, wrapping the C library cfitsio with ctypes.

Pretty easy, first version completely developed in 1 day.

https://github.com/zonca/pycfitsio

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unit testing happiness

21Jun11

nosetests -v
test_all_cols (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_colnames (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_move (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_open_file (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_read_col (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_read_hdus (pycfitsio.test.TestPyCfitsIoRead) ... ok
test_create (pycfitsio.test.TestPyCfitsIoWrite) ... ok
test_write (pycfitsio.test.TestPyCfitsIoWrite) ... ok

----------------------------------------------------------------------
Ran 8 tests in 0.016s

OK

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Pink noise (1/f noise) simulations in numpy

18May11

https://gist.github.com/979729

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Vim regular expressions

29Apr11

very good reference of the usage of regular expressions in VIM:

http://www.softpanorama.org/Editors/Vimorama/vim_regular_expressions.shtml

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set python logging level

13Apr11

often using logging.basicConfig is useless because if the logging module is already configured upfront by one of the imported libraries this is ignored.

The solution is to set the level directly in the root logger:
logging.root.level = logging.DEBUG

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pyfits memory leak in new_table

28Mar11

I found a memory leakage issue in pyfits.new_table, data were NOT deleted when the table was deleted, I prepared a test on github, using objgraph, which shows that data are still in memory:

Filed under: astrophysics, python   |  1 Comment

git make local branch tracking origin

02Feb11

git branch --set-upstream master origin/master

you obtain the same result as initial cloning

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memory map npy files

07Jan11

Mem-map the stored array, and then access the second row directly from disk:

X = np.load('/tmp/123.npy', mmap_mode='r')

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force local install of python module

03Dec10

python setup.py install --prefix FOLDER


creates lib/python2.6/site-packages, to force a local install you should use:

python setup.py install --install-lib FOLDER

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