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Dump a NumPy array into a csv file

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

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Problem

How do I dump a 2D NumPy array into a csv file in a human-readable format?

numpy.savetxt saves an array to a text file.

import numpy
a = numpy.asarray([ [1,2,3], [4,5,6], [7,8,9] ])
numpy.savetxt("foo.csv", a, delimiter=",")

import numpy
a = numpy.asarray([ [1,2,3], [4,5,6], [7,8,9] ])
numpy.savetxt("foo.csv", a, delimiter=",")

Stack Overflow Q#6081008, score: 1276

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