cpython/Doc/lib/libstringio.tex

\section{\module{StringIO} ---
         Read and write strings as if they were files.}
\declaremodule{standard}{StringIO}


\modulesynopsis{Read and write strings as if they were files.}


This module implements a file-like class, \class{StringIO},
that reads and writes a string buffer (also known as \emph{memory
files}). See the description on file objects for operations.

\begin{classdesc}{StringIO}{\optional{buffer}}
When a \class{StringIO} object is created, it can be initialized
to an existing string by passing the string to the constructor.
If no string is given, the \class{StringIO} will start empty.
\end{classdesc}

The following methods of \class{StringIO} objects require special
mention:

\begin{methoddesc}{getvalue}{}
Retrieve the entire contents of the ``file'' at any time before the
\class{StringIO} object's \method{close()} method is called.
\end{methoddesc}

\begin{methoddesc}{close}{}
Free the memory buffer.
\end{methoddesc}


\section{\module{cStringIO} ---
         Faster version of \module{StringIO}, but not subclassable.}
\declaremodule{builtin}{cStringIO}

\modulesynopsis{Faster version of \module{StringIO}, but not subclassable.}


% This section was written by Fred L. Drake, Jr. <fdrake@acm.org>

The module \module{cStringIO} provides an interface similar to that of
the \module{StringIO} module.  Heavy use of \class{StringIO.StringIO}
objects can be made more efficient by using the function
\function{StringIO()} from this module instead.

Since this module provides a factory function which returns objects of
built-in types, there's no way to build your own version using
subclassing.  Use the original \module{StringIO} module in that case.