Doc/reference/simple_stmts.rst

Doc/tutorial/datastructures.rst

Doc/tutorial/introduction.rst

Doc/using/cmdline.rst

Doc/using/windows.rst

Doc/whatsnew/2.0.rst

Doc/whatsnew/2.1.rst

:option:`-I` option can be used to run the script in isolated mode where

:data:`sys.path` contains neither the current directory nor the user's

site-packages directory. All:envvar:`PYTHON*` environment variables are

site-packages directory. All``PYTHON*`` environment variables are

ignored, too.

Many standard library modules contain code that is invoked on their execution

:option:`-I` option can be used to run the script in isolated mode where

:data:`sys.path` contains neither the script's directory nor the user's

site-packages directory. All:envvar:`PYTHON*` environment variables are

site-packages directory. All``PYTHON*`` environment variables are

ignored, too.

..audit-event::cpython.run_file filename

..option::-E

Ignore all:envvar:`PYTHON*` environment variables, e.g.

Ignore all``PYTHON*`` environment variables, e.g.

:envvar:`PYTHONPATH` and:envvar:`PYTHONHOME`, that might be set.

See also the:option:`-P` and:option:`-I` (isolated) options.

and:option:`-s` options.

In isolated mode:data:`sys.path` contains neither the script's directory nor

the user's site-packages directory. All:envvar:`PYTHON*` environment

the user's site-packages directory. All``PYTHON*`` environment

variables are ignored, too. Further restrictions may be imposed to prevent

the user from injecting malicious code.

randomization is enabled by default.

On previous versions of Python, this option turns on hash randomization,

so that the:meth:`__hash__` values of str and bytes objects

so that the:meth:`~object.__hash__` values of str and bytes objects

are "salted" with an unpredictable random value. Although they remain

constant within an individual Python process, they are not predictable

between repeated invocations of Python.

If this environment variable is set to a non-empty string,

:func:`faulthandler.enable` is called at startup: install a handler for

:const:`SIGSEGV`,:const:`SIGFPE`,:const:`SIGABRT`,:const:`SIGBUS` and

:const:`SIGILL` signals to dump the Python traceback. This is equivalent to

:option:`-X` ``faulthandler`` option.

:const:`~signal.SIGSEGV`,:const:`~signal.SIGFPE`,

:const:`~signal.SIGABRT`,:const:`~signal.SIGBUS` and

:const:`~signal.SIGILL` signals to dump the Python traceback.

This is equivalent to:option:`-X` ``faulthandler`` option.

..versionadded::3.3