Python C Shell
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+++++++++++++ Fault handler +++++++++++++ Fault handler for SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL signals: display the Python traceback and restore the previous handler. Allocate an alternate stack for this handler, if sigaltstack() is available, to be able to allocate memory on the stack, even on stack overflow (not available on Windows). Import the module and call faulthandler.enable() to enable the fault handler. Alternatively you can set the PYTHONFAULTHANDLER environment variable to a non-empty value. The fault handler is called on catastrophic cases and so it can only use signal-safe functions (eg. it doesn't allocate memory on the heap). That's why the traceback is limited: it only supports ASCII encoding (use the backslashreplace error handler for non-ASCII characters) and limits each string to 100 characters, doesn't print the source code in the traceback (only the filename, the function name and the line number), is limited to 100 frames and 100 threads. By default, the Python traceback is written to the standard error stream. Start your graphical applications in a terminal and run your server in foreground to see the traceback, or pass a file to faulthandler.enable(). faulthandler is implemented in C using signal handlers to be able to dump a traceback on a crash or when Python is blocked (eg. deadlock). Website: https://faulthandler.readthedocs.io/ faulthandler is part of Python since Python 3.3: http://docs.python.org/dev/library/faulthandler.html