8000 .format does not play well with a 0-D NumPy array · Issue #7978 · numpy/numpy · GitHub
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MechCoder opened this issue Aug 26, 2016 · 3 comments · Fixed by #9883
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.format does not play well with a 0-D NumPy array #7978

MechCoder opened this issue Aug 26, 2016 · 3 comments · Fixed by #9883

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@MechCoder
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Hi,

# This works
a = "%0.3g" % np.array(2)
a
'2'
# This does not
a = "{0:0.3g}".format(np.array(2))
TypeError: non-empty format string passed to object.__format__

Is this a bug?
@MechCoder MechCoder mentioned this issue Aug 26, 2016
Merged
@fmaussion
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Just ran into this as well. This is quite bad, isn't it?

@MechCoder
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Not as bad as using a 0-D NumPy array in the first place :P

But yeah, this should be fixed.

@fmaussion
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0D arrays are a standard output in xarray:

In [1]: import xarray as xr

In [2]: '{:.2g}'.format(xr.DataArray([1, 2, 3]).mean())
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-e521944932df> in <module>()
----> 1 '{:.2g}'.format(xr.DataArray([1, 2, 3]).mean())

TypeError: non-empty format string passed to object.__format__

(CC @shoyer just fyi)

eric-wieser added a commit to eric-wieser/numpy that referenced this issue Oct 18, 2017
@eric-wieser
ENH: Implement ndarray.__format__ for 0d arrays
53a022b 
This fixes numpygh-7978

The behavior for other sized arrays is left unchanged, pending discussion in numpygh-5543
@eric-wieser eric-wieser mentioned this issue Oct 18, 2017
Merged
theodoregoetz pushed a commit to theodoregoetz/numpy that referenced this issue Oct 23, 2017
@eric-wieser @theodoregoetz
ENH: Implement ndarray.__format__ for 0d arrays
3f87c6e 
This fixes numpygh-7978

The behavior for other sized arrays is left unchanged, pending discussion in numpygh-5543
@eric-wieser eric-wieser mentioned this issue Nov 8, 2017
Merged
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ENH: Implement ndarray.__format__ for 0d arrays eric-wieser/numpy
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@MechCoder @fmaussion
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