colalign argument crashes tabulate if no data

[dmoklaf]

This crashes tabulate:

In [2]: tabulate.tabulate([], headers=['a', 'b', 'c', 'd', 'e'], colalign=['left', 'left', 'left', 'left', 'left'])
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
Cell In[2], line 1
----> 1 tabulate.tabulate([], headers=['a', 'b', 'c', 'd', 'e'], colalign=['left', 'left', 'left', 'left', 'left'])

File /opt/homebrew/Caskroom/mambaforge/base/envs/work/lib/python3.11/site-packages/tabulate/__init__.py:2165, in tabulate(tabular_data, headers, tablefmt, floatfmt, intfmt, numalign, stralign, missingval, showindex, disable_numparse, colalign, maxcolwidths, rowalign, maxheadercolwidths)
   2163     assert isinstance(colalign, Iterable)
   2164     for idx, align in enumerate(colalign):
-> 2165         aligns[idx] = align
   2166 minwidths = (
   2167     [width_fn(h) + min_padding for h in headers] if headers else [0] * len(cols)
   2168 )
   2169 cols = [
   2170     _align_column(c, a, minw, has_invisible, enable_widechars, is_multiline)
   2171     for c, a, minw in zip(cols, aligns, minwidths)
   2172 ]

IndexError: list assignment index out of range

Removing the colalign argument resolves the crash, and tabulate outputs correctly an empty table. Adding data into the table also resolves the crash, and tabulate outputs correctly a table with that data.

Versions: tabulate 0.9.0 python 3.11.5 mamba 1.5.1 conda 23.7.4 macos 13.5.2

[ego-thales]

The problem is fixed with #221, but not yet released or pushed on PyPi. You'll need to install from source for now:

git clone https://github.com/astanin/python-tabulate.git
pip install ./python-tabulate
python

Tested in Python 3.11.5

>>> import tabulate
>>> print(tabulate.tabulate([], headers=['a', 'b', 'c', 'd', 'e'], colalign=['left', 'left', 'left', 'left', 'left']))
a    b    c    d    e  
---  ---  ---  ---  ---

Also, notice that #221 made your life simpler with the colglobalalign keyword. Indeed:

>>> import tabulate
>>> print(tabulate.tabulate([], headers=['a', 'b', 'c', 'd', 'e'], colglobalalign='left'))
a    b    c    d    e  
---  ---  ---  ---  ---

Furthermore, you can now align headers differently from data (see help(tabulate.tabulate)).

Cheers!

[dmoklaf]

Outstanding work!