Built-in Module sys

sys This module provides access to some variables used or maintained by the interpreter and to functions that interact strongly with the interpreter. It is always available.


\begin{datadesc}{argv} The list of command line arguments passed to a Python sc... ... was passed to the Python interpreter, \code{sys.argv} is empty. \end{datadesc}


\begin{datadesc}{builtin_module_names} A list of strings giving the names of al... ... --- \code{sys.modules.keys()} only lists the imported modules.) \end{datadesc}


\begin{datadesc}{exc_type} \dataline{exc_value} \dataline{exc_traceback} These ... ...call stack at the point where the exception originally occurred. \end{datadesc}


\begin{funcdesc}{exit}{n} Exit from Python with numeric exit status \var{n}. Th... ... and it is possible to catch the exit attempt at an outer level. \end{funcdesc}


\begin{datadesc}{exitfunc} This value is not actually defined by the module, bu... ...n that case the interpreter's internal state cannot be trusted). \end{datadesc}


\begin{datadesc}{last_type} \dataline{last_value} \dataline{last_traceback} The... ..._type}, \code{exc_value} and \code{exc_tracaback}, respectively. \end{datadesc}


\begin{datadesc}{modules} Gives the list of modules that have already been load... ...an be manipulated to force reloading of modules and other tricks. \end{datadesc}


\begin{datadesc}{path} A list of strings that specifies the search path for mod... ...ariable \code{PYTHONPATH}, or an installation-dependent default. \end{datadesc}


\begin{datadesc}{ps1} \dataline{ps2} Strings specifying the primary and seconda... ...initial values in this case are \code{'>>> '} and \code{'... '}. \end{datadesc}


\begin{funcdesc}{settrace}{tracefunc} Set the system's trace function, which al... ...more documentation (both about \code{pdb} and \code{sys.trace}). \end{funcdesc}
pdb wdb


\begin{funcdesc}{setprofile}{profilefunc} Set the system's profile function, wh... ... its return value is not used, so it can just return \code{None}. \end{funcdesc}


\begin{datadesc}{stdin} \dataline{stdout} \dataline{stderr} File objects corres... ...ng as it has a \code{write} method that takes a string argument. \end{datadesc}


\begin{datadesc}{tracebacklimit} When this variable is set to an integer value, ... ... is suppressed and only the exception type and value are printed. \end{datadesc}