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    <pre><code>import sys sys.exit() </code></pre> <p>details from the <a href="https://docs.python.org/2/library/constants.html#exit" rel="noreferrer" title="exit"><code>sys</code> module documentation</a>:</p> <blockquote> <p><code>sys.<strong>exit</strong>([<em>arg</em>])</code></p> <blockquote> <p>Exit from Python. This is implemented by raising the <a href="https://docs.python.org/2/library/exceptions.html#SystemExit" rel="noreferrer" title="SystemExit"><code>SystemExit</code></a> exception, so cleanup actions specified by finally clauses of <a href="https://docs.python.org/2/reference/compound_stmts.html#try" rel="noreferrer" title="try"><code>try</code></a> statements are honored, and it is possible to intercept the exit attempt at an outer level.</p> <p>The optional argument <em>arg</em> can be an integer giving the exit status (defaulting to zero), or another type of object. If it is an integer, zero is considered “successful termination” and any nonzero value is considered “abnormal termination” by shells and the like. Most systems require it to be in the range 0-127, 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 <a href="https://docs.python.org/2/library/sys.html#sys.stderr" rel="noreferrer" title="sys.stderr"><code>stderr</code></a> and results in an exit code of 1. In particular, <code>sys.exit("some error message")</code> is a quick way to exit a program when an error occurs.</p> <p>Since <a href="https://docs.python.org/2/library/constants.html#exit" rel="noreferrer" title="exit"><code>exit()</code></a> ultimately “only” raises an exception, it will only exit the process when called from the main thread, and the exception is not intercepted.</p> </blockquote> </blockquote> <p>Note that this is the 'nice' way to exit. @<a href="https://stackoverflow.com/questions/73663/terminating-a-python-script#76374">glyphtwistedmatrix</a> below points out that if you want a 'hard exit', you can use os._exit(<em>errorcode</em>), though it's likely os-specific to some extent (it might not take an errorcode under windows, for example), and it definitely is less friendly since it doesn't let the interpreter do any cleanup before the process dies.</p>
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    1. COPresumably `sys.exit()` doesn't work (doesn't kill the process, just kills the thread) if raised by a background thread?
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    2. CO@cesium62: Yes, `sys.exit()` raises a `SystemExit` exception in the current thread.
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