Prevent or dismiss 'empty file' warning in loadtxt

You will have to wrap the line with catch_warnings, then call the simplefilter method to suppress those warnings. For example:

import warnings

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    data = np.loadtxt(myfile, unpack=True)

Should do it.

One obvious possibility is to pre-check the files:

if os.fstat(myfile.fileno()).st_size:
    data = np.loadtxt(myfile, unpack=True)
else:
    # whatever you want to do for empty files

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