astropy masked Table print/repr error traceback

gistfile1.pytb

In [1]: from astropy.table import Table

In [2]:

In [2]: numbers = [1, 2, 3]

In [3]: strings = ['a', 'b', 'c']

In [4]:

In [4]: t_mask_numbers = Table(data=[numbers], masked=True)

In [5]: comparison_numbers_masked = (t_mask_numbers['col0'] == 1)

In [6]: type(comparison_numbers_masked)    # this is a MaskedColumn object
Out[6]: astropy.table.table.MaskedColumn

In [7]: comparison_numbers_masked          # that causes an error on display...
Out[7]: ERROR: TypeError: object of type 'NoneType' has no len() [astropy.table.pprint]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-7-cfa1fbfa9478> in <module>()
----> 1 comparison_numbers_masked          # that causes an error on display...

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/core/displayhook.pyc in __call__(self, result)
    245             self.start_displayhook()
    246             self.write_output_prompt()
--> 247             format_dict, md_dict = self.compute_format_data(result)
    248             self.write_format_data(format_dict, md_dict)
    249             self.update_user_ns(result)

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/core/displayhook.pyc in compute_format_data(self, result)
    155
    156         """
--> 157         return self.shell.display_formatter.format(result)
    158
    159     def write_format_data(self, format_dict, md_dict=None):

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/core/formatters.pyc in format(self, obj, include, exclude)
    150             md = None
    151             try:
--> 152                 data = formatter(obj)
    153             except:
    154                 # FIXME: log the exception

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/core/formatters.pyc in __call__(self, obj)
    479                 type_pprinters=self.type_printers,
    480                 deferred_pprinters=self.deferred_printers)
--> 481             printer.pretty(obj)
    482             printer.flush()
    483             return stream.getvalue()

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/lib/pretty.pyc in pretty(self, obj)
    360                             if callable(meth):
    361                                 return meth(obj, self, cycle)
--> 362             return _default_pprint(obj, self, cycle)
    363         finally:
    364             self.end_group()

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/IPython/lib/pretty.pyc in _default_pprint(obj, p, cycle)
    480     if getattr(klass, '__repr__', None) not in _baseclass_reprs:
    481         # A user-provided repr.
--> 482         p.text(repr(obj))
    483         return
    484     p.begin_group(1, '<')

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/table.pyc in __repr__(self)
    198             self.__class__.__name__,
    199             repr(self.name), repr(units),
--> 200             repr(self.format), repr(self.description), repr(self.data))
    201
    202         return out

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/numpy/ma/core.pyc in __repr__(self)
   3551         name = repr(self._data).split('(')[0]
   3552         parameters = dict(name=name, nlen=" " * len(name),
-> 3553                            data=str(self), mask=str(self._mask),
   3554                            fill=str(self.fill_value), dtype=str(self.dtype))
   3555         if self.dtype.names:

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/numpy/ma/core.pyc in __str__(self)
   3542         else:
   3543             res = self.filled(self.fill_value)
-> 3544         return str(res)
   3545
   3546     def __repr__(self):

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/table.pyc in __str__(self)
    380
    381     def __str__(self):
--> 382         lines, n_header = _pformat_col(self)
    383         return '\n'.join(lines)
    384

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/pprint.pyc in _pformat_col(col, max_lines, show_name, show_units)
    130     outs = {}  # Some values from _pformat_col_iter iterator that are needed here
    131     col_strs = list(_pformat_col_iter(col, max_lines, show_name, show_units, outs))
--> 132     col_width = max(len(x) for x in col_strs)
    133
    134     # Center line content and generate dashed headerline

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/pprint.pyc in <genexpr>((x,))
    130     outs = {}  # Some values from _pformat_col_iter iterator that are needed here
    131     col_strs = list(_pformat_col_iter(col, max_lines, show_name, show_units, outs))
--> 132     col_width = max(len(x) for x in col_strs)
    133
    134     # Center line content and generate dashed headerline

TypeError: object of type 'NoneType' has no len()

In [8]: print (comparison_numbers_masked)  # ...but can be printed!
 col0
-----
 True
False
False

In [9]:

In [9]: t_mask_strings = Table(data=[strings], masked=True)

In [10]: comparison_strings_masked = (t_mask_strings['col0'] == 'a')

In [11]: type(comparison_strings_masked)    # this is a MaskedColumn object
Out[11]: astropy.table.table.MaskedColumn

In [12]: comparison_strings_masked          # that can be displayed...
Out[12]:
<MaskedColumn name=None units=None format=None description=None>
masked_array(data = [True False False],
             mask = [False False False],
       fill_value = True)


In [13]: print (comparison_strings_masked)  # ...but not printed!
ERROR: TypeError: object of type 'NoneType' has no len() [astropy.table.pprint]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-13-fde1e38365c6> in <module>()
----> 1 print (comparison_strings_masked)  # ...but not printed!

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/table.pyc in __str__(self)
    380
    381     def __str__(self):
--> 382         lines, n_header = _pformat_col(self)
    383         return '\n'.join(lines)
    384

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/pprint.pyc in _pformat_col(col, max_lines, show_name, show_units)
    130     outs = {}  # Some values from _pformat_col_iter iterator that are needed here
    131     col_strs = list(_pformat_col_iter(col, max_lines, show_name, show_units, outs))
--> 132     col_width = max(len(x) for x in col_strs)
    133
    134     # Center line content and generate dashed headerline

/Users/mcraig/anaconda/python.app/Contents/lib/python2.7/site-packages/astropy/table/pprint.pyc in <genexpr>((x,))
    130     outs = {}  # Some values from _pformat_col_iter iterator that are needed here
    131     col_strs = list(_pformat_col_iter(col, max_lines, show_name, show_units, outs))
--> 132     col_width = max(len(x) for x in col_strs)
    133
    134     # Center line content and generate dashed headerline

TypeError: object of type 'NoneType' has no len()

In [14]: