---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-12-49433b94b10c> in <module>
----> 1 phot['annulus_mean'] = phot['annulus_sum'] / bkg_aper.area()
      2 phot

TypeError: 'float' object is not callable

ImportError                               Traceback (most recent call last)
<ipython-input-31-63b082d1cf72> in <module>
----> 1 from photutils.utils import random_cmap
      2 
      3 fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(10, 8))
      4 ax1.imshow(data, norm=norm)
      5 lbl1 = ax1.set_title('Data')

ImportError: cannot import name 'random_cmap' from 'photutils.utils' (/Users/apricewhelan/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/photutils/utils/__init__.py)

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndslicing.py in _slice_wcs(self, item)
    122         try:
--> 123             llwcs = SlicedLowLevelWCS(self.wcs.low_level_wcs, item)
    124             return HighLevelWCSWrapper(llwcs)

AttributeError: 'GWCSAdapter' object has no attribute 'low_level_wcs'

The above exception was the direct cause of the following exception:

ValueError                                Traceback (most recent call last)
<ipython-input-8-1cc89492a8c0> in <module>
      1 from specutils.manipulation import extract_region
      2 
----> 3 subspec = extract_region(sdss_spec, pixel_region)
      4 plt.step(subspec.wavelength, subspec.flux)
      5 

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/specutils/manipulation/extract_spectral_region.py in extract_region(spectrum, region)
    133                 left_index, right_index = right_index, left_index
    134 
--> 135             extracted_spectrum.append(spectrum[left_index:right_index])
    136 
    137     # If there is only one subregion in the region then we will

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/specutils/spectra/spectrum1d.py in __getitem__(self, item)
    170                     if self.uncertainty is not None else None)
    171 
--> 172         return super().__getitem__(item)
    173 
    174     def _copy(self, **kwargs):

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndslicing.py in __getitem__(self, item)
     60 
     61         # Let the other methods handle slicing.
---> 62         kwargs = self._slice(item)
     63         return self.__class__(**kwargs)
     64 

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndslicing.py in _slice(self, item)
     90         kwargs['uncertainty'] = self._slice_uncertainty(item)
     91         kwargs['mask'] = self._slice_mask(item)
---> 92         kwargs['wcs'] = self._slice_wcs(item)
     93         # Attributes which are copied and not intended to be sliced
     94         kwargs['unit'] = self.unit

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndslicing.py in _slice_wcs(self, item)
    124             return HighLevelWCSWrapper(llwcs)
    125         except Exception as err:
--> 126             self._handle_wcs_slicing_error(err, item)
    127 
    128     # Implement this in a method to allow subclasses to customise the error.

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndslicing.py in _handle_wcs_slicing_error(self, err, item)
    130         raise ValueError(f"Slicing the WCS object with the slice '{item}' "
    131         "failed, if you want to slice the NDData object without the WCS, you "
--> 132         "can remove by setting `NDData.wcs = None` and then retry.") from err

ValueError: Slicing the WCS object with the slice 'slice(2100, 2600, None)' failed, if you want to slice the NDData object without the WCS, you can remove by setting `NDData.wcs = None` and then retry.

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-15-7c3b8bbd638e> in <module>
----> 1 from astroquery.sdss import SDSS
      2 sdss = SDSS.query_region(coordinates=hcg7_center, radius=20*u.arcmin, 
      3                          spectro=True,
      4                          photoobj_fields=['ra','dec','u','g','r','i','z'])

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astroquery/sdss/__init__.py in <module>
     25 conf = Conf()
     26 
---> 27 from .core import SDSS, SDSSClass

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astroquery/sdss/core.py in <module>
     17 from ..utils import commons, async_to_sync, prepend_docstr_nosections
     18 from ..exceptions import RemoteServiceError, NoResultsWarning
---> 19 from .field_names import (photoobj_defs, specobj_defs,
     20                           crossid_defs, get_field_info)
     21 

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astroquery/sdss/field_names.py in <module>
     11 
     12 from . import conf
---> 13 from ..utils.testing_tools import MockResponse
     14 
     15 __all__ = ['get_field_info', 'photoobj_defs', 'specobj_defs', 'crossid_defs']

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astroquery/utils/testing_tools.py in <module>
      4 import json
      5 
----> 6 import pytest
      7 
      8 # save original socket method for restoration

ModuleNotFoundError: No module named 'pytest'

---------------------------------------------------------------------------
UnitConversionError                       Traceback (most recent call last)
~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity_helper/helpers.py in get_converter(from_unit, to_unit)
     31     try:
---> 32         scale = from_unit._to(to_unit)
     33     except UnitsError:

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/core.py in _to(self, other)
    950         raise UnitConversionError(
--> 951             f"'{self!r}' is not a scaled version of '{other!r}'")
    952 

UnitConversionError: 'Unit("Jy")' is not a scaled version of 'Unit("erg / (Angstrom cm2 s)")'

During handling of the above exception, another exception occurred:

UnitConversionError                       Traceback (most recent call last)
~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity_helper/helpers.py in get_converters_and_unit(f, unit1, unit2)
     76         try:
---> 77             converters[changeable] = get_converter(unit2, unit1)
     78         except UnitsError:

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity_helper/helpers.py in get_converter(from_unit, to_unit)
     34         return from_unit._apply_equivalencies(
---> 35                 from_unit, to_unit, get_current_unit_registry().equivalencies)
     36     except AttributeError:

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/core.py in _apply_equivalencies(self, unit, other, equivalencies)
    887             "{} and {} are not convertible".format(
--> 888                 unit_str, other_str))
    889 

UnitConversionError: 'Jy' (spectral flux density) and 'erg / (Angstrom cm2 s)' (spectral flux density wav) are not convertible

During handling of the above exception, another exception occurred:

UnitConversionError                       Traceback (most recent call last)
<ipython-input-10-0477c1496b1f> in <module>
----> 1 newspec1d - jyspec1d

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/specutils/spectra/spectrum1d.py in __sub__(self, other)
    334 
    335         return self.subtract(
--> 336             other, compare_wcs=lambda o1, o2: self._compare_wcs(self, other))
    337 
    338     def __mul__(self, other):

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndarithmetic.py in subtract(self, operand, operand2, **kwargs)
    524     def subtract(self, operand, operand2=None, **kwargs):
    525         return self._prepare_then_do_arithmetic(np.subtract, operand, operand2,
--> 526                                                 **kwargs)
    527 
    528     @sharedmethod

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndarithmetic.py in _prepare_then_do_arithmetic(self_or_cls, operation, operand, operand2, **kwargs)
    612 
    613         # Now call the _arithmetics method to do the arithmetics.
--> 614         result, init_kwds = operand._arithmetic(operation, operand2, **kwargs)
    615 
    616         # Return a new class based on the result

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndarithmetic.py in _arithmetic(self, operation, operand, propagate_uncertainties, handle_mask, handle_meta, uncertainty_correlation, compare_wcs, **kwds)
    244         # Then calculate the resulting data (which can but not needs to be a
    245         # quantity)
--> 246         result = self._arithmetic_data(operation, operand, **kwds2['data'])
    247 
    248         # Determine the other properties

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/nddata/mixins/ndarithmetic.py in _arithmetic_data(self, operation, operand, **kwds)
    320         else:
    321             result = operation(self.data * self.unit,
--> 322                                operand.data * operand.unit)
    323 
    324         return result

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity.py in __array_ufunc__(self, function, method, *inputs, **kwargs)
    459         # consistent units between two inputs (e.g., in np.add) --
    460         # and the unit of the result (or tuple of units for nout > 1).
--> 461         converters, unit = converters_and_unit(function, method, *inputs)
    462 
    463         out = kwargs.get('out', None)

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity_helper/converters.py in converters_and_unit(function, method, *args)
    164 
    165         # Determine possible conversion functions, and the result unit.
--> 166         converters, result_unit = ufunc_helper(function, *units)
    167 
    168         if any(converter is False for converter in converters):

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/units/quantity_helper/helpers.py in get_converters_and_unit(f, unit1, unit2)
     80                 "Can only apply '{}' function to quantities "
     81                 "with compatible dimensions"
---> 82                 .format(f.__name__))
     83 
     84         return converters, unit1

UnitConversionError: Can only apply 'subtract' function to quantities with compatible dimensions

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-27-dd856df23ce6> in <module>
----> 1 phot = aperture_photometry(data * unit, aperture, error=tot_error * u.adu)
      2 phot

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/astropy/utils/decorators.py in wrapper(*args, **kwargs)
    519                             kwargs[new_name[i]] = value
    520 
--> 521             return function(*args, **kwargs)
    522 
    523         return wrapper

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/photutils/aperture/photometry.py in aperture_photometry(data, apertures, error, mask, method, subpixels, unit, wcs)
    196     # handle data, error, and unit inputs
    197     # output data and error are ndarray without units
--> 198     data, error, unit = _handle_units(data, error, unit)
    199 
    200     # compute variance and apply input mask

~/anaconda/envs/astropy-workshop/lib/python3.7/site-packages/photutils/aperture/_photometry_utils.py in _handle_units(data, error, unit)
    136         if error is not None:
    137             if unit != error.unit:
--> 138                 raise ValueError('data and error must have the same units.')
    139             error = error.value
    140 

ValueError: data and error must have the same units.