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    <p>Python has its own built-in singal handler for <code>SIGINT</code>. This handler simply raises <code>KeyboardInterrupt</code>. In your first code, you replaced the built-in handler with the new handler hence you see this output:</p> <pre><code>$python test_exc.py ^Cinterrupted </code></pre> <p>Note that <code>io interrupted</code> is <strong>not</strong> printed, since no exception was raised. In fact modifying the code to:</p> <pre><code>import signal,sys def handleInt(sign,no): print "interrupted" signal.signal(signal.SIGINT, handleInt) # exception raised is IOError try: sys.stdin.read(1) except IOError: print "io interrupt" else: # else is executed only if no exception was raised print "done" </code></pre> <p>You get:</p> <pre><code>$python test_exc.py ^Cinterrupted done </code></pre> <p>Note that hitting <code>Ctrl+C</code> does <em>not</em> block the call to <code>sys.stdin.read(1)</code> hence you still have to press some key to let the program continue. Raising an exception inside the signal handler will raise it as if the call to <code>sys.stdin.read(1)</code> produced it:</p> <pre><code>import signal,sys def handleInt(sign,no): print "interrupted" raise OSError signal.signal(signal.SIGINT, handleInt) # exception raised is IOError try: sys.stdin.read(1) except IOError: print "io interrupt" else: # else is executed only if no exception was raised print "done" </code></pre> <p>Sample run:</p> <pre><code>$python test_exc.py ^Cinterrupted Traceback (most recent call last): File "test_exc.py", line 10, in &lt;module&gt; sys.stdin.read(1) File "test_exc.py", line 5, in handleInt raise OSError OSError </code></pre> <hr> <p>Note: you can access the default signal handler via <code>signal.default_int_handler</code>.</p>
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    1. POin python , why is there a difference in exception when signal handling is done before and after "try except"
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    1. USBakuriu
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      1. VTUpMod
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    1. CONot to mention that signal handler is never registered...
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      1. USaychedee
    2. CObut in my case , "io interrupted " is printed and the statement in else is not
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      1. USkaryboy
    3. CO@karyboy What OS are you using and which python version? I've done my tests with python 2.7.4 on Kubuntu 13.04 (linux kernel: 3.8.0).
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