saving array of string and integers to a text file in python [duplicate]

Question

I have a python list

temp = [['abc.jpg', 1, 2, 3, 'xyz'], ['def.jpg', 4,5,6, 'xyz']]

To save it as an array, so I do this:

temp = np.vstack(temp)

Result:

print(temp)
temp = [['abc.jpg', '1', '2', '3', 'xyz'], ['def.jpg', '4','5','6', 'xyz']]

It is converting the integers to string. I dont want that to happen.

I want to save the result in a text file.

I tried the following:

np.savetxt("data.txt", temp)

But I get the following error:

TypeError: Mismatch between array dtype ('<U8') and format specifier ('%.18e %.18e %.18e %.18e %.18e %.18e')

A string array like this has to be saved with %s format. To retain more control on the display of numbers you need to create a structured array, which can be saved with savetxt. The duplicate sort-of helps with the structured array, but does not use savetxt. I'm sure there are newer better duplicates. — hpaulj
– hpaulj, Commented Oct 31, 2017 at 16:26

jimidime · Accepted Answer · 2017-10-31 10:57:20Z

3

try this(it saves every row separated by ";"):

 np.savetxt("data.txt", temp, delimiter=" ", newline = "\n", fmt="%s")

edited Oct 31, 2017 at 10:57

answered Oct 31, 2017 at 10:52

jimidime

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5 Comments

Bart Over a year ago

That gives a one line file with abc.jpg 1 2 3 xyz;def.jpg 4 5 6 xyz;

jimidime Over a year ago

@Bart how do you want to save?

Blue Over a year ago

np.savetxt("data.txt", temp, delimiter=" ", newline = "\n", fmt="%s") - this saves in new line. Works perfectly for me! Thanks

Bart Over a year ago

@Blue; which python/numpy/.. version? In my case (Python 3.6, Numpy 1.13) your solution does work (without converting 1 to "1")

Blue Over a year ago

using 3.5.3 python version and 1.13.3 numpy version. I turned my list into an array with temp = np.array(temp). Upon printing it I get temp = [['abc.jpg', '1', '2', '3', 'xyz'], ['def.jpg', '4','5','6', 'xyz']] but when I open the textfile there are no strings. It is saved as abc.jpg 1 2 3 xyz def.jpg 4 5 6 xyz

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