Missing optional dependency 'tables'. In pandas to_hdf

I got it to work by using

conda install snappy

For conda users:

conda install pytables

• The issue was with tables.
• When i was installing tables using pip into local user directory using following command it's not working.

pip install --user tables

• Running import tables will result in this error.

  ImportError: Could not load any of ['hdf5.dll', 'hdf5dll.dll'], please ensure that it can be found in the system path

• The solution that worked for me is to uninstall tables. And install it into python's directory. (or where your python is installed). without --user option. You may require admin/root access for this depending upon location of your python.

• For me my python path was C:\Program Files\Python37-64\python.exe and installing under c:\program files\python37-64\lib\site-packages\ worked for me.
• Hope this helps. I don't know why installing in user directory is not working for tables. If anyone can find the reason for that please post here.