Peek the number of rows in an hdf5 file in pandas

Question

I was wondering if there was a way of easily, quickly, and without loading the entire file, getting the number of rows in an hdf5 file, created using pandas, with pandas?

Thank you in advance!

Answer 1

In [1]: DataFrame(np.random.randn(10,10)).to_hdf('test.h5','df',mode='w',format='table')

In [3]: store = pd.HDFStore('test.h5')

In [4]: store
Out[4]: 
<class 'pandas.io.pytables.HDFStore'>
File path: test.h5
/df            frame_table  (typ->appendable,nrows->10,ncols->10,indexers->[index])

In [5]: store.get_storer('df').nrows
Out[5]: 10