Multiple string replacement...

[Simon Brunning]

I'm trying to put together a script which will replace values in files. The
idea is that you can specify multiple replacements at once. For example you
can replace 'Spam' with 'eggs' and 'Jesus' with 'Brian' in one pass.

So, I read the replacement sets in from a file, and store them in a list of
lists, thus:

replacements = [['Spam', 'eggs,], ['Jesus', 'Brian']]

Then I read in my file data, and do:

for replacement in replacements:
        filedata = filedata.replace(replacement[0], replacement[1])

This all works OK, except...

I set up a ROT13 replacement set, which looks like:
[['A', 'N'], ['B', 'O'], ['C', 'P'], ['D', 'Q'], ['E', 'R'], ['F', 'S'],
['G', 'T'], ['H', 'U'], ['I', 'V'], ['J', 'W'], ['K', 'X'], ['L', 'Y'],
['M', 'Z'], ['N', 'A'], ... and so on. The problem here is that after 'A'
and been replaced by 'N', it gets replaced back again.

Anyone got a cunning plan?

Cheers,
Simon Brunning
TriSystems Ltd.
sbrunning at trisystems.co.uk

P.S. Sorry about the legal gibberish below - out of my hands, I'm afraid. I
wouldn't mind so much, except for the poor grammar...




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