[Tutor] Regex parsing and writing to file

[Kent Johnson]

jon vspython wrote:
> Hi,
> I tried this on a file:
> 
> for line in fileinput.input("myfile",inplace=1):
>     re.sub(r'LOOP',r'PRUEBALOOP',line)

I'm not sure why you got any output at all. Were you running this in a 
shell that prints out loop values for you (e.g. IPython)?

re.sub returns the modified line. Try
   import sys
   sys.stdout.write(re.sub(r'LOOP',r'PRUEBALOOP',line))

I used stdout.write() instead of print because you already have the 
needed line endings in place.

Kent

> 
> and for lines like this:
> 
> PT_WT_INIT:                   LOOP
> 
> I got this:
> 
> 'PT_WT_INIT:                   PRUEBALOOP\r\n'
> 
> I also tried without raw strings:
> 
> re.sub('LOOP','PRUEBALOOP',line)
> 
> but I got the same result.
> 
> Any hint?
> Thanks, Jon.
> 
>