python - Appending more datasets into an existing Hdf5 file without deleting other groups and datasets -

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i have hdf5 file contains groups , subgroups inside there datasets. want open file , add datasets groups. took following approach quite simple in python. 

    import h5py     f = h5py.file('filename.h5','w')     f.create_dataset('/group1/subgroup1/dataset4', data=pngfile)     f.close()

the before file looked before file image

after file looks after file image

but want not delete other datasets , groups rather append dataset4 in line.

just python open() function, 'w' truncate existing file. use 'a' mode add content file:

import h5py f = h5py.file('filename.h5','a') f.create_dataset('/group1/subgroup1/dataset4', data=pngfile) f.close()

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