(easy question) Find and replace multiple items

[ds4ff1z]

Tim Chase wrote:
> > Hello, i'm looking to find and replace multiple characters in a text
> > file (test1). I have a bunch of random numbers and i want to replace
> > each number with a letter (such as replace a 7 with an f  and 6 with a
> > d). I would like a suggestion on an a way to do this.  Thanks
>
> Well, the canonical way would be to use a tool designed to do
> transformations:
>
> 	tr '76' 'fd' < test1.txt > out.txt
>
> However, if it's python you want:
>
>  >>> mapping = {'7': 'f', '6': 'd'}
>  >>> s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
>  >>> ''.join([mapping.get(c, c) for c in s])
> 'ABCDEFGHIJKLMNOPQRSTUVWXYZ12345df890'
>
> will transform all the items found in "s" according to the
> defined mapping.
>
> Or, depending on your string length and the number of items
> you're replacing:
>
>  >>> for k,v in mapping.items(): s = s.replace(k,v)
>
> may be a better choice.  Or maybe they're both lousy choices. :)
>   Time it and choose accordingly.
> 
> -tkc


Thanks for the solutions!