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en weer twee!

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Guido van Rossum 1995-03-01 14:36:00 +00:00
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\section{Built-in module \sectcode{tempfile}}
\stmodindex{tempfile}
\indexii{temporary}{file name}
\indexii{temporary}{file}
\renewcommand{\indexsubitem}{(in module tempfile)}
This module generates temporary file names. It is not UNIX specific,
but it may require some help on non-UNIX systems.
Note: the modules does not create temporary files, nor does it
automatically remove them when the current process exits or dies.
The module defines a single user-callable function:
\begin{funcdesc}{mktemp}{}
Return a unique temporary filename. This is an absolute pathname of a
file that does not exist at the time the call is made. No two calls
will return the same filename.
\end{funcdesc}
The module uses two global variables that tell it how to construct a
temporary name. The caller may assign values to them; by default they
are initialized at the first call to \code{mktemp()}.
\begin{datadesc}{tempdir}
When set to a value other than \code{None}, this variable defines the
directory in which filenames returned by \code{mktemp()} reside. The
default is taken from the environment variable \code{TMPDIR}; if this
is not set, either \code{/usr/tmp} is used (on UNIX), or the current
working directory (all other systems). No check is made to see
whether its value is valid.
\end{datadesc}
\ttindex{TMPDIR}
\begin{datadesc}{template}
When set to a value other than \code{None}, this variable defines the
prefix of the final component of the filenames returned by
\code{mktemp()}. A string of decimal digits is added to generate
unique filenames. The default is either ``\code{@\var{pid}.}'' where
\var{pid} is the current process ID (on UNIX), or ``\code{tmp}'' (all
other systems).
\end{datadesc}
Warning: if a UNIX process uses \code{mktemp()}, then calls
\code{fork()} and both parent and child continue to use
\code{mktemp()}, the processes will generate conflicting temporary
names. To resolve this, the child process should assign \code{None}
to \code{template}, to force recomputing the default on the next call
to \code{mktemp()}.

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\section{Built-in module \sectcode{traceback}}
\stmodindex{traceback}
\renewcommand{\indexsubitem}{(in module traceback)}
This module provides a standard interface to format and print stack
traces of Python programs. It exactly mimics the behavior of the
Python interpreter when it prints a stack trace. This is useful when
you want to print stack traces under program control, e.g. in a
``wrapper'' around the interpreter.
The module uses traceback objects --- this is the object type
that is stored in the variables \code{sys.exc_traceback} and
\code{sys.last_traceback}.
The module defines the following functions:
\begin{funcdesc}{print_tb}{traceback\optional{\, limit}}
Print up to \var{limit} stack trace entries from \var{traceback}. If
\var{limit} is omitted or \code{None}, all entries are printed.
\end{funcdesc}
\begin{funcdesc}{extract_tb}{traceback\optional{\, limit}}
Return a list of up to \var{limit} ``pre-processed'' stack trace
entries extracted from \var{traceback}. It is useful for alternate
formatting of stack traces. If \var{limit} is omitted or \code{None},
all entries are extracted. A ``pre-processed'' stack trace entry is a
quadruple (\var{filename}, \var{line number}, \var{function name},
\var{line text}) representing the information that is usually printed
for a stack trace. The \var{line text} is a string with leading and
trailing whitespace stripped; if the source is not available it is
\code{None}.
\end{funcdesc}
\begin{funcdesc}{print_exception}{type\, value\, traceback\optional{\, limit}}
Print exception information and up to \var{limit} stack trace entries
from \var{traceback}. This differs from \code{print_tb} in the
following ways: (1) if \var{traceback} is not \code{None}, it prints a
header ``\code{Traceback (innermost last):}''; (2) it prints the
exception \var{type} and \var{value} after the stack trace; (3) if
\var{type} is \code{SyntaxError} and \var{value} has the appropriate
format, it prints the line where the syntax error occurred with a
caret indication the approximate position of the error.
\end{funcdesc}
\begin{funcdesc}{print_exc}{\optional{limit}}
This is a shorthand for \code{print_exception(sys.exc_type,}
\code{sys.exc_value,} \code{sys.exc_traceback,} \code{limit)}.
\end{funcdesc}
\begin{funcdesc}{print_last}{\optional{limit}}
This is a shorthand for \code{print_exception(sys.last_type,}
\code{sys.last_value,} \code{sys.last_traceback,} \code{limit)}.
\end{funcdesc}

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\section{Built-in module \sectcode{tempfile}}
\stmodindex{tempfile}
\indexii{temporary}{file name}
\indexii{temporary}{file}
\renewcommand{\indexsubitem}{(in module tempfile)}
This module generates temporary file names. It is not UNIX specific,
but it may require some help on non-UNIX systems.
Note: the modules does not create temporary files, nor does it
automatically remove them when the current process exits or dies.
The module defines a single user-callable function:
\begin{funcdesc}{mktemp}{}
Return a unique temporary filename. This is an absolute pathname of a
file that does not exist at the time the call is made. No two calls
will return the same filename.
\end{funcdesc}
The module uses two global variables that tell it how to construct a
temporary name. The caller may assign values to them; by default they
are initialized at the first call to \code{mktemp()}.
\begin{datadesc}{tempdir}
When set to a value other than \code{None}, this variable defines the
directory in which filenames returned by \code{mktemp()} reside. The
default is taken from the environment variable \code{TMPDIR}; if this
is not set, either \code{/usr/tmp} is used (on UNIX), or the current
working directory (all other systems). No check is made to see
whether its value is valid.
\end{datadesc}
\ttindex{TMPDIR}
\begin{datadesc}{template}
When set to a value other than \code{None}, this variable defines the
prefix of the final component of the filenames returned by
\code{mktemp()}. A string of decimal digits is added to generate
unique filenames. The default is either ``\code{@\var{pid}.}'' where
\var{pid} is the current process ID (on UNIX), or ``\code{tmp}'' (all
other systems).
\end{datadesc}
Warning: if a UNIX process uses \code{mktemp()}, then calls
\code{fork()} and both parent and child continue to use
\code{mktemp()}, the processes will generate conflicting temporary
names. To resolve this, the child process should assign \code{None}
to \code{template}, to force recomputing the default on the next call
to \code{mktemp()}.

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Doc/libtraceback.tex Normal file
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@ -0,0 +1,54 @@
\section{Built-in module \sectcode{traceback}}
\stmodindex{traceback}
\renewcommand{\indexsubitem}{(in module traceback)}
This module provides a standard interface to format and print stack
traces of Python programs. It exactly mimics the behavior of the
Python interpreter when it prints a stack trace. This is useful when
you want to print stack traces under program control, e.g. in a
``wrapper'' around the interpreter.
The module uses traceback objects --- this is the object type
that is stored in the variables \code{sys.exc_traceback} and
\code{sys.last_traceback}.
The module defines the following functions:
\begin{funcdesc}{print_tb}{traceback\optional{\, limit}}
Print up to \var{limit} stack trace entries from \var{traceback}. If
\var{limit} is omitted or \code{None}, all entries are printed.
\end{funcdesc}
\begin{funcdesc}{extract_tb}{traceback\optional{\, limit}}
Return a list of up to \var{limit} ``pre-processed'' stack trace
entries extracted from \var{traceback}. It is useful for alternate
formatting of stack traces. If \var{limit} is omitted or \code{None},
all entries are extracted. A ``pre-processed'' stack trace entry is a
quadruple (\var{filename}, \var{line number}, \var{function name},
\var{line text}) representing the information that is usually printed
for a stack trace. The \var{line text} is a string with leading and
trailing whitespace stripped; if the source is not available it is
\code{None}.
\end{funcdesc}
\begin{funcdesc}{print_exception}{type\, value\, traceback\optional{\, limit}}
Print exception information and up to \var{limit} stack trace entries
from \var{traceback}. This differs from \code{print_tb} in the
following ways: (1) if \var{traceback} is not \code{None}, it prints a
header ``\code{Traceback (innermost last):}''; (2) it prints the
exception \var{type} and \var{value} after the stack trace; (3) if
\var{type} is \code{SyntaxError} and \var{value} has the appropriate
format, it prints the line where the syntax error occurred with a
caret indication the approximate position of the error.
\end{funcdesc}
\begin{funcdesc}{print_exc}{\optional{limit}}
This is a shorthand for \code{print_exception(sys.exc_type,}
\code{sys.exc_value,} \code{sys.exc_traceback,} \code{limit)}.
\end{funcdesc}
\begin{funcdesc}{print_last}{\optional{limit}}
This is a shorthand for \code{print_exception(sys.last_type,}
\code{sys.last_value,} \code{sys.last_traceback,} \code{limit)}.
\end{funcdesc}