perl code to python, alpha character to next alphabet charater?

[DON WAGNER]

I'm just staring out in python.
I recently posted for some help about re [A-Za-z0-9] and how to use it in 
Python.
I know this code is possible in Python because it is very easy in perl:

#Takes a file and changes character to the next character in alphabet.

$TheFile = "hello";
open(INFILE, $TheFile)
$_=<INFILE>;
tr/A-Ya-yZz/B-Zb-zAa/;
print$_;
Still working on regular expressions and reo.sub
Thanks, don
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