python3-numpy: Appending to a file using numpy savetxt

You should open file by binary mode.

#!/usr/bin/env python3import 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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