#!/usr/bin/env python3
import h5py
from numpy import loadtxt
from sys import argv

with h5py.File("collect.h5","w") as h5:
    for afile in argv[1:]:
        print(afile)
        data = loadtxt(afile)
        # here is the data type an intt64, could be also Float64 (f), int32 (i8), etc. 
        dataset = h5.create_dataset(f"{afile}", data=data, compression='gzip', shuffle=True, dtype="i") 
        # example for an attribute for this dataset (the original filename)
        dataset.attrs["filename"] = afile

h5.close()
# do not forget to delete the files