[Tutor] converting upper case to lowercase and vice-versa

[Shall, Sydney]

I am just learning Python and my book does not solve my problem.
I have not yet been successful in searching the Python 2.7.3 tutorial
I am doing an encryption exercise.

Python 2.7.3
MAC OS X 10.6.8

What is the correct syntax to covert English characters from uppercase 
to lowercase and from lowercase to uppercase?

With many thanks,

Sydney

-- 
Professor Sydney Shall,
Department of Haematological Medicine,
King's College London,
Medical School,
123 Coldharbour Lane,
LONDON SE5 9NU,
Tel & Fax: +44 (0)207 848 5902,
E-Mail: sydney.shall,
[correspondents outside the College should add; @kcl.ac.uk]
www.kcl.ac.uk

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