.h5 file format does not close properly

Question

import h5py #added
hf = h5py.File('../images.h5', 'w') #added
hf.close() #added

h5_file = tables.open_file("images.h5", mode="w")

I also tried:

h5py.File.close(hf)

the error that pops up in both cases is:

ValueError: The file 'restricted_images.h5' is already opened.  Please close it before reopening in write mode.

I've also tried:

if isinstance(obj, h5py.File):   # Just HDF5 files
    obj.close()

while

In[]: hf
Out[]: <Closed HDF5 file> 

, the file is not closed yet.