How to change array of floats to array of strings, then save to txt

Question

I know this question is addressed here: Numpy converting array from float to strings, but I am having trouble with the implementation.

A=np.array([57/13, 7/5, 6/8])
B=A.astype('|S4' )

yields array([b'4.38',b'1.4', b'0.75]). The b's remain when I save to txt.

np.savetxt('my_file.txt', B, fmt="%s")

The issue of why the b's are there is discussed here: What does the 'b' character do in front of a string literal?, but with no explanation for how to get rid of them. Any help?

Also, is there any way to get rid of the ' ' around each string when printing?

savetxt fmt gives you more formatting control than astype. Try np.savetxt('myfile.txt',A,fmt='%.2f') — hpaulj
– hpaulj, Commented Jul 22, 2015 at 7:08

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

'S', 'a' - (byte-)string

'U' - Unicode

S is for Byte-String, hence the b infront.

You should use U instead for unicode strings, and then save it to text.

Example -

A=np.array([57/13, 7/5, 6/8])
B=A.astype('U4')

np.savetxt('my_file.txt', B, fmt="%s")

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answered Jul 22, 2015 at 6:49

Anand S Kumar

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1 Comment

Thank you! You are the best.