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    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. Changed in version 3. Append the callable hook to the list of active auditing hooks for the current interpreter. When an auditing event is raised through the sys. Raise an auditing event sys. If any existing hooks raise an exception derived sysexits RuntimeErrorthe new hook will not be sysexits and the exception suppressed.

    As a result, callers cannot assume that their hook has been added unless they sysexits all existing hooks. Otherwise, trace functions will skip the hook. The list of command line arguments passed to a Python script.

    If the command was executed using the -c command line option to the interpreter, argv[0] is set to pythoj string '-c'. If no script name was passed to the Python interpreter, argv[0] is the empty string. To loop over the standard input, or the list of files given on the command line, see the fileinput module.

    On Unix, command line arguments are sysexits by bytes from OS. When you need original bytes, you can get it by [os. Raise an auditing event with any active hooks. The event name is a string identifying the event and its associated schema, which is the number and types of arguments.

    The schema for a sysexlts event is considered public and stable API and should not be modified between releases. This function will raise the first exception raised by any pgthon.

    In general, these errors should not be handled and should terminate the process as quickly as possible. Hooks are added using the sys. Using the native function python preferred when possible. See the audit events table for all events raised stsexits CPython. Set during Python startup, before site. If not running in a virtual environmentthe values will stay the same; if site. An indicator of the native byte order. This will have the value 'big' on big-endian most-significant byte first platforms, and 'little' on little-endian least-significant byte first platforms.

    A tuple of strings giving the names of all modules that are compiled into this Python interpreter. This information is not sysexits in any other way — modules. The tracing state is saved, and pyfhon afterwards. This is intended to be called from a debugger from a checkpoint, to recursively debug some other code.

    Clear the python type cache. The type cache is used to speed up attribute and method lookups. Use the function only to drop unnecessary references during reference leak debugging. Note that functions in the traceback module can build the call stack given such a frame. Raises an auditing event sys. This hook function is called by built-in breakpoint.

    By default, it drops you into the pdb debugger, but it can be set sysexihs any other function so that you can choose which debugger gets used. The signature of this function python dependent on what it calls.

    For example, the default binding e. Whatever breakpointhooks returns is returned from breakpoint. If that is set to "0" then this function returns immediately; i. If the environment variable is not set, or is set to the empty string, pdb.

    In this case, package. Also note that if sys. If Python is configured —with-pydebug, it also performs some expensive internal consistency checks. CPython implementation detail: This function is specific to CPython. The exact output format is not defined python, and may change. Availability : Windows. If value is not Nonethis function prints repr value to sys. If repr value is not encodable to sys.

    The display of these values can be customized by assigning another one-argument function to sys. If this is set not NonePython will write bytecode-cache. Thus if you use compileall as a pre-build step, you must python you run it with the same pycache prefix if any that you will use at runtime.

    If neither are set, it is None. This function prints out a given traceback and exception to sys. When an exception is raised and uncaught, the interpreter calls sys. In an interactive session this happens just before control is returned to the prompt; in a Python program this happens just before the program exits.

    The handling of such top-level exceptions can be pythonn by assigning another three-argument function to sys. If no hook has been set, hook may be None. If any hook raises an exception derived from RuntimeError the call to the hook will be suppressed. Otherwise, the audit hook exception will be reported as unraisable and sys.

    The sys. These objects contain the original values of breakpointhookdisplayhookexcepthookand unraisablehook at the start of the program. They are saved so that breakpointhookdisplayhook and excepthook sysexits, unraisablehook can be python in case they happen to get replaced with broken or alternative objects.

    This function returns a tuple of three values that give information about the exception that is currently being handled. The information returned python specific both to the current thread and to the current stack frame.

    If the current stack frame is not handling an exception, the information is taken python the calling stack frame, or its caller, and so on until a stack frame is found that is handling an exception.

    If no exception is being handled anywhere on the ppython, a tuple containing three None values is returned. Otherwise, the values returned are type, value, traceback. Their meaning is: type gets the type ssysexits the exception being handled a subclass of BaseException ; value gets the exception instance an instance of the exception type ; traceback gets a traceback object which encapsulates the call stack at the point where the exception originally occurred.

    This can be set at build time with sysexits --exec-prefix argument to the sysexits script. Specifically, all configuration files e. Y is the version number of Python, for example 3. If sysecits virtual environment is in effect, this value will be changed in site.

    A string giving the absolute path of the executable binary for the Python interpreter, on systems where this makes sense. If Python is unable to retrieve the real path to sysexits executable, sys. Exit from Python.

    This is implemented by raising the SystemExit exception, so cleanup actions specified by finally clauses of try statements are honored, and it is possible to intercept the exit attempt at an outer level. The optional argument arg can be an integer giving the exit status defaulting to zeroor another type y object.

    Most systems require it to be in the range 0—, and produce undefined results otherwise. Some systems have a convention for assigning specific meanings to specific exit codes, but these are generally underdeveloped; Unix programs generally use 2 for command line syntax errors and 1 for all other kind of errors. If another type of object is passed, None is equivalent to passing zero, and any other object is printed to stderr and results in an exit code of 1.

    In particular, sys. The named tuple flags exposes the status of command line flags. The attributes are read only. New in version 3. A named tuple holding information about the float type. It contains sysexitts level information about the precision and internal representation. The values correspond to the various floating-point constants defined pyhhon the standard header file float. See section 5.

    The attribute sys. If s is any string representing a decimal number with at most sys. But for strings with more than sys. A string indicating how the repr function behaves for floats.

    This is the usual behaviour in Python 3. Return the number of memory blocks currently allocated by the interpreter, regardless of their size. This function is mainly useful for tracking and debugging memory leaks. If a Python build or implementation cannot reasonably python this information, getallocatedblocks is allowed to return 0 instead.

    There are no real constants in Python like those in C++, where const can be used​. in the system's sysexits.h Cheaders file: import os import sys borregosprings.info(os. borregosprings.info › library › sys. Specifically, all configuration files (e.g. the pyconfig.h header file) are installed in the directory exec_prefix/lib/pythonX.Y/config, and shared.

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    By using our site, you acknowledge that you sysexits read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for python and sysexits coworkers to find and share information. I'm trying to make my code play nicely with the other children on Linux systems, and I want to use exit codes that make sense to the shell.

    In the specific case I'm starting with, when attempting to write to a directory that sysexits not exist, I find two candidate codes:. I note that Python provides errno and there is a corresponding errno. EDIT: I was trying to determine if I should be using more specific exit codes and if so, from which set of predefined codes. The answers below give a pretty definite "No": Sysexits to 0 for success and 1 python failure as exit codes. Use the errno codes for stderr messages, python, for Linux at least, just stay away from sysexits.

    I think. As sysexits rule specifically, precedent set by UNIXa program python uses python few exit codes: 0 for success; optionally, one for each other valid outcome that is not an error e. The code for "any error" is usually the highest. Some programs use special codes for some errors, but these are few and far between. Any more specific information about the error is supposed to be printed on stderr.

    The motivation for a "catch-all" error exit sysexits is that without additional information, the receiving process cannot python anything intelligent about the error anyway. Learn more. Python exit with error: Use sysexits.

    Ask Question. Asked python year, 1 month ago. Active python year, 1 month ago. Viewed 76 times. Is one more appropriate than sysexits other for a sys. Ubuntourist Ubuntourist python 10 silver badges 23 23 bronze badges. Possible sysexits of Are there any standard exit status codes in Linux? Specifically, see this answer: stackoverflow.

    Not exactly a duplicate question, though the answer DanielPryden linked to in his suggestion was quite helpful. More like "duplicate answer". That's actually the point of duplicate questions on Stack Overflow: sysexits doesn't mean "bad question", it means "let's consolidate efforts to answer all these questions in this one place that already has answers".

    Often the same answers are helpful for lots of different sysexits related questions. Sign up or log in Sign up python Google. Sign up using Facebook. Sign up python Email and Password. Post as a guest Name. Email Required, but never shown. Copying code from Stack Overflow? You might paste security vulnerabilities, too. Featured on Meta. Feedback post: Moderator review and reinstatement processes. Upvotes on questions will now be worth the same as upvotes on answers. Linked Related Hot Network Questions.

    Question feed. Stack Overflow works best with JavaScript sysexits.

    EDIT: I sysexits trying to determine if I should be using more specific exit codes and if so, from which set of predefined codes. The type cache is used to speed up attribute and python lookups. sex dating

    This module provides access to some variables used or maintained by the sysexits and to functions that interact strongly with the interpreter. It is always available. The list of command line arguments passed to a Python script. If the command was executed using the -c command line option to the interpreter, argv[0] is set to the string '-c'. If no script name was passed to the Python interpreter, argv[0] is the empty string. To loop over the standard input, or the list of files given on the command line, see the fileinput module.

    An indicator of the native byte order. This will have the value 'big' on big-endian most-significant byte first platforms, and 'little' on little-endian least-significant byte first platforms.

    A tuple of strings giving the names of all modules that are compiled into this Python interpreter. This information is not available in any other way — modules. The tracing state is saved, and restored afterwards. This is intended to be called from a debugger from a checkpoint, to recursively debug some other code. Clear the internal type sysexits. The type cache is used to speed up attribute and method lookups.

    Use the function only to drop unnecessary references during reference leak debugging. Note that functions in the traceback module can build the call stack given such a frame.

    If value is not Nonethis function prints it to sys. The display of these values can be customized by assigning another one-argument function to sys. This function prints out a given traceback and exception to sys. When an exception is raised and uncaught, the interpreter calls sys. In an interactive session this happens just before control is returned to the prompt; in a Python program this happens just before the program exits. The handling of such top-level exceptions can be customized by python another three-argument function to sys.

    These objects contain the original values of displayhook and excepthook at the start of the program. They are saved so that displayhook and excepthook can be restored in case they happen to get replaced with broken objects. This function returns a tuple of three values that give information about the exception that is currently python handled. The information returned is specific both python the current thread and to the current stack frame.

    If the current stack frame is not handling an exception, the information is taken from the calling stack frame, or its caller, and so on until a stack frame is found that is handling an exception. If python exception is being handled anywhere on the stack, a tuple containing three None values is returned.

    Otherwise, the values returned are type, value, traceback. Their meaning is: type gets the exception type of the exception being handled a class object ; value gets the exception parameter its associated value or the second argument to raisewhich is always a class instance if the exception type is a class object ; traceback gets a traceback object see the Reference Manual which encapsulates the call stack at the point where the exception originally occurred.

    Assigning the traceback return value to a local variable in a function that is handling an exception will cause a circular reference. This will prevent anything referenced python a local variable in the same function or by the traceback from being garbage collected. Beginning with Python 2. This function clears python information relating to python current or last exception that occurred in the current thread. This function is only needed in only a few obscure situations.

    These include logging and error handling systems that report information on the last or current sysexits. This function can also be used to try to free resources and trigger object finalization, though no python is made as to what objects will be freed, if any.

    Deprecated since version 1. Since they are global variables, they are not specific to the current thread, so their use is not safe in a multi-threaded program. This can be set at build time with the --exec-prefix argument to the configure script.

    Specifically, all configuration files e. Y is the version number of Python, for example 2. A string giving the absolute path of the executable binary for the Python interpreter, on systems where this makes sense.

    If Python is unable to sysexits the sysexits path sysexits its executable, sys. Exit from Python. This is implemented by raising the SystemExit exception, so cleanup actions specified by finally clauses of try statements are honored, and it is possible to intercept the exit attempt at an outer level. The optional argument arg can be an integer giving the exit status defaulting to zeroor another type of object.

    Most systems require it to be in the range 0—, and produce undefined results otherwise. Some systems have a convention for assigning specific meanings to specific exit codes, but these are generally underdeveloped; Unix programs generally use 2 for command line syntax errors and 1 for all other kind of errors.

    If another type of object is passed, None is equivalent to passing zero, and any other object is printed to stderr and results in an exit code of 1. In particular, sys. This value is not actually defined by the module, but can be set python the user or by a program to specify a clean-up action at program exit. When set, it should be a parameterless function. This function will be called when the interpreter exits. Only one function may be installed in this way; to allow multiple functions which will be called at termination, use the atexit module.

    The exit function is not called when the program is killed by a signal, when a Python fatal internal error is detected, or when os. Deprecated since version 2. The struct sequence flags exposes the status of command line flags. The attributes are read only.

    New in version 2. A structseq holding information about sysexits float type. It contains low level information about the precision and internal representation. The values correspond to the various floating-point constants defined in the standard header file float. See section 5. Python attribute sys. If s is any string representing a decimal number with at most sys. But for strings with more than sys.

    A string sysexits how the repr function behaves for floats. This is the usual behaviour in Python 2. Return the current value of the flags that are used for dlopen calls. Availability: Unix.

    Return the name of the encoding used to convert Unicode filenames into system file names, or None python the system default encoding is used. The result value depends on the operating system:. On Mac OS X, the encoding is 'utf-8'. On Windows 9x, the encoding is 'mbcs'. Return the reference count of the object. The count returned is generally one higher than you might expect, because it includes the temporary sysexits as an argument to getrefcount.

    Return the current value of the recursion limit, the maximum depth of the Python interpreter stack. This limit prevents infinite recursion from causing an overflow of the C stack and crashing Python. It can be set by setrecursionlimit. Return the size of an object in bytes. The object can be any type of object. All built-in objects will return correct results, but this does not have to hold true for third-party extensions as it is implementation specific.

    If given, default will be sysexits if the object does not provide sysexits to retrieve the size. Otherwise a TypeError will be raised. Return sysexits frame object from the call stack. If optional integer depth is given, return the frame object that many calls below the top of the stack.

    If that is deeper than the call stack, ValueError is raised. The default for depth is zero, returning the frame at the top of the call stack. CPython implementation detail: This function should be used for internal and specialized purposes only.

    It is not guaranteed to exist in all implementations of Python. Get the profiler function as set by setprofile. Get the trace function as set by settrace.

    CPython implementation detail: The gettrace function is intended only for implementing debuggers, profilers, coverage tools and the like. Its behavior is part of the implementation platform, rather than part of the language definition, python thus may not be available in all Python implementations. Return a named tuple describing the Windows version currently running.

    The components can also be accessed by name, so sys. For compatibility with prior versions, only the first 5 elements are retrievable by indexing. Changed in version 2.

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    Specifically, all configuration files (e.g. the pyconfig.h header file) are installed in the directory exec_prefix/lib/pythonX.Y/config, and shared. Specifically, all configuration files (e.g. the pyconfig.h header file) are installed in the directory exec_prefix/lib/pythonX.Y/config, and shared library modules are. borregosprings.info › LDP › abs › html › exitcodes.

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    sys — System-specific parameters and functions — Python documentationlinux - Python exit with error: Use sysexits.h or errno.h codes? - Stack Overflow

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