What is the source code of the “this” module doing?

by

This is called rot13 encoding:

d = {}
for c in (65, 97):
    for i in range(26):
        d[chr(i+c)] = chr((i+13) % 26 + c)

Builds the translation table, for both uppercase (this is what 65 is for) and lowercase (this is what 97 is for) chars.

print "".join([d.get(c, c) for c in s])

Prints the translated string.

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