How to list all datasets in h5py file?

Question

I have a h5py file storing numpy arrays, but I got Object doesn't exist error when trying to open it with the dataset name I remember, so is there a way I can list what datasets the file has?

   with h5py.File('result.h5','r') as hf:         #How can I list all dataset I have saved in hf? 

Answer 1

You have to use the keys method. This will give you a List of unicode strings of your dataset and group names. For example:

Datasetnames=hf.keys() 

Another gui based method would be to use HDFView. https://support.hdfgroup.org/products/java/release/download.html

Answer 2

The other answers just tell you how to make a list of the keys under the root group, which may refer to other groups or datasets.

If you want something closer to h5dump but in python, you can do something like that:

import h5py  def descend_obj(obj,sep='\t'):     """     Iterate through groups in a HDF5 file and prints the groups and datasets names and datasets attributes     """     if type(obj) in [h5py._hl.group.Group,h5py._hl.files.File]:         for key in obj.keys():             print sep,'-',key,':',obj[key]             descend_obj(obj[key],sep=sep+'\t')     elif type(obj)==h5py._hl.dataset.Dataset:         for key in obj.attrs.keys():             print sep+'\t','-',key,':',obj.attrs[key]  def h5dump(path,group='/'):     """     print HDF5 file metadata      group: you can give a specific group, defaults to the root group     """     with h5py.File(path,'r') as f:          descend_obj(f[group])