Question

I want to to write np.double to formatted file:

import numpy as np
a='12 45 87 34 65';
s=np.double(a.split())
fid=open('qqq.txt','wt')
fid.write('%5.1f %5.1f %5.1f %5.1f %5.1f ' %(s[0],s[1],s[2],s[3],s[4]))
fid.close()

Can this “write” row be written in a shorter way?

fid.write('%5.1f %5.1f %5.1f %5.1f %5.1f ' %(s[0],s[1],s[2],s[3],s[4]))

Answer 1

One way is this

In [48]: ''.join('%5.1f ' % n for n in s)
Out[48]: ' 12.0  45.0  87.0  34.0  65.0 '

Another way is

In [49]: ('%5.1f ' * len(s)) % tuple(s)
Out[49]: ' 12.0  45.0  87.0  34.0  65.0 '