title: Dimensions of data stored in HDF5
body: <p>I have several <code>.h5</code> files which contain Pandas DataFrames created with the <code>.to_hdf</code> method. My question is quite simple : is it possible to retrieve the dimension of the DataFrame stored in the <code>.h5</code> file without loading all the data in RAM ?</p>
  
  <p>Motivation : the DataFrames stored in those HDF5 files are quite big (up to several Gb) and loading all the data just to get the shape of the data is really time consuming. </p>