python3-numpy: Appending to a file using numpy savetxt

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You should open file by binary mode.

#!/usr/bin/env python3
import numpy as np        
f=open('asd.dat','ab')
for iind in range(4):
    a=np.random.rand(10,10)
    np.savetxt(f,a)
f.close()

reference:
python – How to write a numpy array to a csv file? – Stack Overflow How to write a numpy array to a csv file?

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