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Add traitlet for validating number format #1550

merged 11 commits into from Jul 31, 2017


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pbugnion commented Jul 29, 2017

Prior to this PR, the readout_format trait was validated as a unicode in the {Float,Int}{,Range}Slider widgets. If the format was not a valid d3 format, this lead to an exception being thrown client-side, but that exception wasn't visible to the user. This lead to issue #1544 .

This PR adds a trait that validates that the format string is correctly formatted. The code for this PR is very much inspired by the format specifier parsing code in d3-format.

>>> import ipywidgets as widgets
>>> widgets.FloatSlider(readout_format='..3f')
# [...] stack trace

TraitError: The 'readout_format' trait of a FloatSlider instance must be a valid number format, but a value of u'..3f' <type 'unicode'> was specified.

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jasongrout commented Jul 31, 2017

Thanks. Looks good to me, and thanks for adding tests too!

@jasongrout jasongrout merged commit a455d9d into jupyter-widgets:master Jul 31, 2017

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jasongrout added a commit to jasongrout/ipywidgets that referenced this pull request Jul 31, 2017

@jasongrout jasongrout modified the milestone: 7.0 Aug 1, 2017

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