Spectrum1D.__str__ formatting error

[bmorris3]

If I make a Spectrum1D and print it with:

import numpy as np
from specutils import Spectrum1D
import astropy.units as u

flux = np.arange(2**3).reshape((2, 2, 2)) * u.dn

s3d = Spectrum1D(flux=flux)
print(s3d)

I get the following traceback:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
File ~/miniconda3/envs/roman2/lib/python3.11/site-packages/astropy/units/quantity.py:1535, in Quantity.__format__(self, format_spec)
   1534 try:
-> 1535     return self.to_string(format=format_spec)
   1536 except ValueError:
   1537     # We might have a unit format not implemented in `to_string()`.

File ~/miniconda3/envs/roman2/lib/python3.11/site-packages/astropy/units/quantity.py:1451, in Quantity.to_string(self, unit, precision, format, subfmt)
   1450 if format not in formats:
-> 1451     raise ValueError(f"Unknown format '{format}'")
   1452 elif format is None:

ValueError: Unknown format '.5'

During handling of the above exception, another exception occurred:

TypeError                                 Traceback (most recent call last)
Cell In[10], line 1
----> 1 print(s3d)

File ~/miniconda3/envs/roman2/lib/python3.11/site-packages/specutils/spectra/spectrum1d.py:750, in Spectrum1D.__str__(self)
    748     for i, flux in enumerate(self.flux):
    749         label = 'flux{:2}'.format(i)
--> 750         result += self._format_array_summary(label, flux) + '\n'
    751 else:
    752     result += self._format_array_summary('flux', self.flux) + '\n'

File ~/miniconda3/envs/roman2/lib/python3.11/site-packages/specutils/spectra/spectrum1d.py:734, in Spectrum1D._format_array_summary(self, label, array)
    732     mean = np.mean(array)
    733     s = "{:17} [ {:.5}, ..., {:.5} ],  mean={:.5}"
--> 734     return s.format(label+':', array[0], array[-1], mean)
    735 else:
    736     return "{:17} [ ],  mean= n/a".format(label+':')

File ~/miniconda3/envs/roman2/lib/python3.11/site-packages/astropy/units/quantity.py:1545, in Quantity.__format__(self, format_spec)
   1543 # Can the value be formatted on its own?
   1544 try:
-> 1545     return f"{format(self.value, format_spec)}{self._unitstr:s}"
   1546 except ValueError:
   1547     # Format the whole thing as a single string.
   1548     return format(f"{self.value}{self._unitstr:s}", format_spec)

TypeError: unsupported format string passed to numpy.ndarray.__format__

Using specutils v1.11.0, py 3.9.12, platform: osx-arm64.

[bmorris3]

Thank you @rosteen!