python read line by line and keep indent

[Peter Otten]

Souvik Dutta wrote:

> You can actually read and write in a file simultaneously. Just replace "r"
> with "w+" if the file has not been previously made or use "r+" is the file
> has already been made.

Good advice for those who like to butcher their data ;)

Seriously, writing modified data into a new file is the cleaner and safer 
method in most cases.