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Clarify the + and b mode characters for open() a bit.

This commit is contained in:
Guido van Rossum 1998-07-29 21:05:35 +00:00
parent b35631587b
commit 5fdd119aba
1 changed files with 8 additions and 6 deletions
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14
Doc/lib/libfuncs.tex
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@ -392,12 +392,14 @@ any kind of sequence; the result is always a list.
\code{'a'} opens it for appending (which on \emph{some} \UNIX{}
systems means that \emph{all} writes append to the end of the file,
regardless of the current seek position).
Modes \code{'r+'}, \code{'w+'} and
\code{'a+'} open the file for updating, provided the underlying
\code{stdio} library understands this. On systems that differentiate
between binary and text files, \code{'b'} appended to the mode opens
the file in binary mode. If the file cannot be opened,
\exception{IOError} is raised.
Modes \code{'r+'}, \code{'w+'} and \code{'a+'} open the file for
updating (note that \code{'w+'} truncates the file). Append
\code{'b'} to the mode to open the file in binary mode, on systems
that differentiate between binary and text files (else it is
ignored). If the file cannot be opened, \exception{IOError} is
raised.
If \var{mode} is omitted, it defaults to \code{'r'}.
The optional \var{bufsize} argument specifies the file's desired
buffer size: 0 means unbuffered, 1 means line buffered, any other