hi
unfortunately numpy text io in python3 is very broken and best avoided.
Technically you might be able to work around it by opening the file in
binary mode but that is the wrong way of doing it and might break when
we finally get around to really fixing it, also won't work for unicode
and string containing escape characters (e.g. windows filenames).
On 12/26/2015 12:47 PM, Maxim Mayzel wrote:
> Dear all,
>
> I’m having a problem writing an array with np.savetxt, see below.
> (python3.5, numpy 1.10.1)
>
> import numpy as np
> a=np.ones(5,dtype=int)
> np.savetxt('t.txt',a)
>
> Works fine, but the content of ’t.txt’ is overwritten.
> But, passing file handle gives an error, while it works fine on python2.7 !
>
>
> with open('t.txt','w') as t:
>np.savetxt(t,a,fmt='%i')
> ...:
> ---
> TypeError Traceback (most recent call last)
> /Users/may/anaconda/lib/python3.5/site-packages/numpy/lib/npyio.py in
> savetxt(fname, X, fmt, delimiter, newline, header, footer, comments)
> 1155 try:
> -> 1156 fh.write(asbytes(format % tuple(row) + newline))
> 1157 except TypeError:
>
> TypeError: write() argument must be str, not bytes
>
> During handling of the above exception, another exception occurred:
>
> TypeError Traceback (most recent call last)
> in ()
> 1 with open('t.txt','w') as t:
> > 2 np.savetxt(t,a,fmt='%i')
> 3
>
> /Users/may/anaconda/lib/python3.5/site-packages/numpy/lib/npyio.py in
> savetxt(fname, X, fmt, delimiter, newline, header, footer, comments)
> 1158 raise TypeError("Mismatch between array dtype
> ('%s') and "
> 1159 "format specifier ('%s')"
> -> 1160 % (str(X.dtype), format))
> 1161 if len(footer) > 0:
> 1162 footer = footer.replace('\n', '\n' + comments)
>
> TypeError: Mismatch between array dtype ('int64') and format specifier ('%i’)
>
>
> Best,
> Dr. Maxim Mayzel
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