value error

[Gerhard Häring]

Francesco Pietra wrote:
> hi:
> with script
> 
> data = open('134-176_rectified_edited.pdb', 'r')
> outp = open('134-176_renumbered.pdb', 'w')
> 
> for L in data:
>    if L[3] == 'M':
>      L = L[:24] + "%4d" % (int(L[24-28])+133) + L[28:]
>    outp.write(L)
> 
> 
> i wanted to modify lines of the type:
> ATOM      1 HH31 ACE     1       1.573   1.961   0.769  1.00  0.00           H
> 
> to add 133 to column 25, getting 134 there, and so on for next lines 2
> -> 135, 3 -> 136, etc.
> 
> 
> i must have heavily messed things because the file was not even read:
> 
> $ python renumber.py 134-176_rectified.pdb
> Traceback (most recent call last):
>   File "renumber.py", line 6, in <module>
>     L = L[:24] + "%4d" % (int(L[24-28])+133) + L[28:]
> ValueError: invalid literal for int() with base 10: ''

Instead of L[24-28] you want L[24:28]. Otherwise it's L[-4] ;-)

-- Gerhard