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Incorrect error message when setting element of unmasked array to ma.masked #8461
Description
When setting an element of an unmasked array to ma.masked, the error message is ValueError: setting an array element with a sequence.. This error message is confusing or outright wrong. The same error message happens in other contexts, for example, if warning are turned to errors then UserWarning: converting masked element to nan becomes the same error message.
In [301]: A = arange(5)
In [303]: A[0] = ma.masked
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-303-286b16dc7aa0> in <module>()
----> 1 A[0] = ma.masked
ValueError: setting an array element with a sequence.
Reacted by Eric Wieser
Activity
eric-wieser commentedon Sep 23, 2017
This is super weird. Ultimately, the problem is that
->f->setitemon numeric types does not know how to handle 0d arrays. The bug doesn't exist for string types, because thatsetitemhandler does know how to deal with it (as of #8903).It's not clear to me how we end up calling
setitemhere at all - there's something special going on withmaskedthat I can't reproduce with a plain 0d arrayeric-wieser commentedon Sep 23, 2017
It gets weirder:
BUG: Errors thrown by 0d arrays in setitem are silenced and replaced