Dump a NumPy array into a csv file

Question

Is there a way to dump a NumPy array into a CSV file? I have a 2D NumPy array and need to dump it in human-readable format.

Answer 1

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=",") 

Answer 2

You can use pandas. It does take some extra memory so it's not always possible, but it's very fast and easy to use.

import pandas as pd  pd.DataFrame(np_array).to_csv("path/to/file.csv") 

if you don't want a header or index, use to_csv("/path/to/file.csv", header=None, index=None)