Como convocar o arquivo .npz para o arquivo txt em python

import numpy as np
import sys
data = np.load("file_name.npz")
print(data.files)
row = data.files
np.set_printoptions(threshold=np.inf)
print(data['arr_0'])
sys.stdout=open("test.txt","w")
for i in row:
    print("--------------------------")
    print(data[i])
sys.stdout.close()
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