How to create and write to multiple files in Python?

Question

I have a for loop in Python and in every iteration I would like to write the result to a new text file.

import numpy as np

n = 5
g = my_func()
for i in range(n):
    """ I wan to have test0.txt for i = 0
    test1.txt for i = 1 and so on ...
    """
    f = open('test.txt','ab')
    np.savetxt(f, g, fmt='%.0f', newline=" ")
f.close()

Is this possible?

My real value of n is 1000

Cory Kramer · Accepted Answer · 2015-06-11 18:40:11Z

2

You can use format to create the string for the filename

f = open('test{}.txt'.format(i), 'ab')

So your code could be modified to

import numpy as np
n = 5
g = my_func()
for i in range(n):
    with open('test{}.txt'.format(i), 'ab') as f:
        np.savetxt(f, g, fmt='%.0f', newline=" ")

answered Jun 11, 2015 at 18:40

Cory Kramer

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