Python Data Fetching

[davidthomas5412]

Problem:

1. Fetch.csh requires C shell
2. Have to fetch data for demos 'by hand'
3. Have long paths, and very wide lines in editor, throughout the codebase, ex:

S = pangloss.Shearmap([PANGLOSS_DIR+'/data/GGL_los_8_0_0_N_4096_ang_4_rays_to_plane_37_f.gamma_1',PANGLOSS_DIR+'/data/GGL_los_8_0_0_N_4096_ang_4_rays_to_plane_37_f.gamma_2'],FITS=False)

Proposed Solution:
Write static python class that has methods that can (i) check whether files have been downloaded, (ii) downloads them, and (iii) has static variable for all the files. This will lead to a better user experience and only requires that the user has python.

[drphilmarshall]

Looks like this is coming along well over in your fork, David! Feel free to open the pull request into drphilmarshall/wl any time.

[drphilmarshall]

Good plan. I do this in my StatisticalMethods class all the time, you
shoudl be able to find starter code in the "examples" notebooks there, You
can also find it in the SLTimer project that I work on, in the
DarkEnergyScienceCollaboration GitHub repo.

On Thu, Oct 20, 2016 at 10:17 AM, David Thomas notifications@github.com
wrote:

Problem:

1. Fetch.csh requires C shell
2. It is annoying to fetch data for demos 'by hand'

Proposed Solution:
Write static python class that has methods that can (i) check whether
files have been downloaded, and (ii) downloads them. This will lead to a
better user experience and only requires that the user has python.

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