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Fix dayofweek and dayofyear attributes from dates generated by cftime_range #2633

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merged 5 commits into from Dec 28, 2018

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spencerkclark
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@spencerkclark spencerkclark commented Dec 25, 2018

  • Tests added

It turns out there was a remaining bug in cftime (Unidata/cftime#106) that impacted the results of the dayofwk and dayofyr attributes of cftime objects generated by their replace method, which we use when parsing dates from strings, and in some offset arithmetic.

A workaround is to add a dayofwk=-1 argument to each replace call where the dayofwk or dayofyr would be expected to change. I've fixed this bug upstream in cftime (Unidata/cftime#108), but it will only be available in a future version. Would it be appropriate to use this workaround in xarray?

This would fix this doc page for instance:

screen shot 2018-12-25 at 7 40 30 am

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pep8speaks commented Dec 25, 2018

Hello @spencerkclark! Thanks for updating the PR.

Cheers ! There are no PEP8 issues in this Pull Request. 🍻

Comment last updated on December 26, 2018 at 14:02 Hours UTC

@dcherian
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I think we should include this workaround and plan to bump up the minimum cftime version sometime soon.

@shoyer shoyer merged commit a8e5002 into pydata:master Dec 28, 2018
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shoyer commented Dec 28, 2018

agreed, thanks!

@spencerkclark spencerkclark deleted the cftime-doy-dow-fix branch December 28, 2018 22:55
dcherian pushed a commit to yohai/xarray that referenced this pull request Jan 2, 2019
* master:
  DEP: drop python 2 support and associated ci mods (pydata#2637)
  TST: silence warnings from bottleneck (pydata#2638)
  revert to dev version
  DOC: fix docstrings and doc build for 0.11.1
  Source encoding always set when opening datasets (pydata#2626)
  Add flake check to travis (pydata#2632)
  Fix dayofweek and dayofyear attributes from dates generated by cftime_range (pydata#2633)
  silence import warning (pydata#2635)
  fill_value in shift (pydata#2470)
  Flake fixed (pydata#2629)
  Allow passing of positional arguments in `apply` for Groupby objects (pydata#2413)
  Fix failure in time encoding for pandas < 0.21.1 (pydata#2630)
  Fix multiindex selection (pydata#2621)
  Close files when CachingFileManager is garbage collected (pydata#2595)
  added some logic to deal with rasterio objects in addition to filepaths (pydata#2589)
  Get 0d slices of ndarrays directly from indexing (pydata#2625)
  FIX Don't raise a deprecation warning for xarray.ufuncs.{angle,iscomplex} (pydata#2615)
  CF: also decode time bounds when available (pydata#2571)
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4 participants