import numpy
a = numpy.asarray([ [1,2,3], [4,5,6], [7,8,9] ])
numpy.savetxt("foo.csv", a, delimiter=",")Reference
https://stackoverflow.com/questions/6081008/dump-a-numpy-array-into-a-csv-file
[Python] Dump NumPy array into csv
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Byung Hoon Ahn 