Editing a file by substitution

[Terry Reedy]

Brad wrote:
> alex23 wrote:

>>>>> open('outfile','w').writelines(l.replace('Volume 940','Volume 950') 
>>>>> for l in open('myfile','r'))
> 
> Ahh yes, perhaps string function are simpler to use in this case.
> Thanks Alex!

If, if you have to change the file repeatedly, make it a template 
(either % or the new .format variety) and substitute in the value you want.