Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

ValueError when opening a read-only hdf twice

See original GitHub issue

In [3]: with pd.HDFStore('/tmp/file_I_can_only_read.hdf') as store:
   ...:     store['test'] = pd.Series(range(3))
   ...:     

In [4]: os.chmod('/tmp/file_I_can_only_read.hdf', 0o400)

In [5]: store1 = pd.HDFStore('/tmp/file_I_can_only_read.hdf')
Opening /tmp/file_I_can_only_read.hdf in read-only mode

In [6]: store2 = pd.HDFStore('/tmp/file_I_can_only_read.hdf')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-6-5b173bb4a3e8> in <module>()
----> 1 store2 = pd.HDFStore('/tmp/file_I_can_only_read.hdf')

/home/pietro/nobackup/repo/pandas/pandas/io/pytables.py in __init__(self, path, mode, complevel, complib, fletcher32, **kwargs)
    402         self._fletcher32 = fletcher32
    403         self._filters = None
--> 404         self.open(mode=mode, **kwargs)
    405 
    406     @property

/home/pietro/nobackup/repo/pandas/pandas/io/pytables.py in open(self, mode, **kwargs)
    563                             hdf_version=tables.get_hdf5_version()))
    564 
--> 565             raise e
    566 
    567         except (Exception) as e:

/home/pietro/nobackup/repo/pandas/pandas/io/pytables.py in open(self, mode, **kwargs)
    538 
    539         try:
--> 540             self._handle = tables.open_file(self._path, self._mode, **kwargs)
    541         except (IOError) as e:  # pragma: no cover
    542             if 'can not be written' in str(e):

/usr/lib/python3/dist-packages/tables/file.py in open_file(filename, mode, title, root_uep, filters, **kwargs)
    308                     "The file '%s' is already opened, but "
    309                     "in read-only mode.  Please close it before "
--> 310                     "reopening in append mode." % filename)
    311             # 'w' means that we want to destroy existing contents
    312             elif mode == 'w':

ValueError: The file '/tmp/file_I_can_only_read.hdf' is already opened, but in read-only mode.  Please close it before reopening in append mode.