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\textbf{Manipulating strings}
String indexing starts from 0, like lists.
\lstinline|s = `Hello World'|\\
\lstinline|s[0:5]| gives \texttt{Hello}\\
\lstinline|s[6:]| gives \texttt{World}\\
\lstinline|s[6::2]| gives \texttt{Wrd}\\
\lstinline|s.replace('e', 'a')| returns a new string with all e's
replaced by a.
\lstinline|s.lower()| and \lstinline|s.upper()| return new strings
with all lower and upper case letters, respectively.
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