How to use `numpy.savez` in a loop for save more than one array?

Question

From a loop I\'m getting an array. I want to save this arrays in a tempfile. The problem is that np.savez only saves the last array from the loop.

Answer 1

I am not an experienced programmer, but this is the way I did it (just in case it may help someone in the future). In addition, it is the first time that I am posting here, so I apologize if I am not following some kind of standard ;)

Creating the npz file:

import numpy as np

tmp = file("C:\\Windows\\Temp\\temp_npz.npz",'wb')

# some variables
a= [23,4,67,7]
b= ['w','ww','wwww']
c= np.ones((2,6))

# a lit containing the name of your variables
var_list=['a','b','c']

# save the npz file with the variables you selected
str_exec_save = "np.savez(tmp,"    
for i in range(len(var_list)):    
    str_exec_save += "%s = %s," % (var_list[i],var_list[i])
str_exec_save += ")"
exec(str_exec_save)

tmp.close

Loading the variables with their original names:

import numpy as np
import tempfile

tmp = open("C:\\Windows\\Temp\\temp_npz.npz",'rb')

# loading of the saved variables
var_load = np.load(tmp)

# getting the name of the variables
files = var_load.files

# loading then with their original names
for i in range(len(files)):
    exec("%s = var_load['%s']" % (files[i],files[i]) )

The only difference is that the variables will become numpy variables.