Expand Up @@ -437,6 +437,73 @@ values.
The integer must be a decimal number in the range [0,4294967295]. Specifying the value 0 will disable hash randomization. .IP PYTHONMALLOC Set the Python memory allocators and/or install debug hooks. The available memory allocators are .IR malloc and .IR pymalloc . The available debug hooks are .IR debug , .IR malloc_debug , and .IR pymalloc_debug . .IP When Python is compiled in debug mode, the default is .IR pymalloc_debug and the debug hooks are automatically used. Otherwise, the default is .IR pymalloc . .IP PYTHONMALLOCSTATS If set to a non-empty string, Python will print statistics of the pymalloc memory allocator every time a new pymalloc object arena is created, and on shutdown. .IP This variable is ignored if the .RB $ PYTHONMALLOC environment variable is used to force the .BR malloc (3) allocator of the C library, or if Python is configured without pymalloc support. .IP PYTHONASYNCIODEBUG If this environment variable is set to a non-empty string, enable the debug mode of the asyncio module. .IP PYTHONTRACEMALLOC If this environment variable is set to a non-empty string, start tracing Python memory allocations using the tracemalloc module. .IP The value of the variable is the maximum number of frames stored in a traceback of a trace. For example, .IB PYTHONTRACEMALLOC=1 stores only the most recent frame. .IP PYTHONFAULTHANDLER If this environment variable is set to a non-empty string, .IR faulthandler.enable() is called at startup: install a handler for SIGSEGV, SIGFPE, SIGABRT, SIGBUS and SIGILL signals to dump the Python traceback. .IP This is equivalent to the \fB-X faulthandler\fP option. .IP PYTHONEXECUTABLE If this environment variable is set, .IB sys.argv[0] will be set to its value instead of the value got through the C runtime. Only works on Mac OS X. .IP PYTHONUSERBASE Defines the user base directory, which is used to compute the path of the user .IR site-packages directory and Distutils installation paths for .IR "python setup\.py install \-\-user" . .IP PYTHONPROFILEIMPORTTIME If this environment variable is set to a non-empty string, Python will show how long each import takes. This is exactly equivalent to setting \fB\-X importtime\fP on the command line. .SS Debug-mode variables Setting these variables only has an effect in a debug build of Python, that is, if Python was configured with the \fB\--with-pydebug\fP build option. .IP PYTHONTHREADDEBUG If this environment variable is set, Python will print threading debug info. .IP PYTHONDUMPREFS If this environment variable is set, Python will dump objects and reference counts still alive after shutting down the interpreter. .SH AUTHOR The Python Software Foundation: https://www.python.org/psf/ .SH INTERNET RESOURCES Expand Down