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\textbf{Getting Started -- files}
\lstinline|f = open('filename')| returns a file object. \lstinline|f|
can be used to perform further operations on the file.
\lstinline|f.read()| reads the whole file and returns the contents.
\lstinline|f.close()| closes the file.
\lstinline|for line in open('filename'):| -- iterate over the file
line-by-line.
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