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From: Rodrick Brown <rodrick.brown@gmail.com>
Date: Mon, 4 Feb 2013 16:49:37 -0500
Subject: error in except
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For the life of me I cant figure out why this exception is being thrown.
How could I use pdb to debug this?

$ python udp_local2.py server
  File "udp_local2.py", line 36
    except:
         ^
SyntaxError: invalid syntax


#!/usr/bin/env python

import random, socket, sys
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

MAX = 65535
PORT = 1060

if 2 <= len(sys.argv) <= 3 and sys.argv[1] == 'server':
    interface = sys.argv[2] if len(sys.argv) > 2 else ''
    s.bind((interface, PORT))
    print 'Listening at', s.getsockname()
    while True:
        data, address = s.recvfrom(MAX)
        if random.randint(0, 1):
            print 'The client at', address, 'says:', repr(data)
            s.sendto('Your data was %d bytes' % len(data), address)
        else:
            print 'Pretending to drop packet from', address

elif len(sys.argv) == 3 and sys.argv[1] == 'client':
    hostname = sys.argv[2]
    s.connect((hostname, PORT))
    print 'Client socket name is', s.getsockname()
    delay = 0.1
    while True:
        s.send('This is another message')
        print 'Waiting up to', delay, 'seconds for a reply'
        s.settimeout(delay)
        try:
            data = s.recv(MAX)
        except socket.timeout:
            delay *= 2
            if delay > 2.0:
                raise RuntimeError('I think the server is down')
            except:
                raise
            else:
                break
        print 'The server says', repr(data)
    else:
        print >> sys.stderr, 'usage: %d server [<interfae>]' % sys.argv[0]
        print >> sys.stderr, '   or: %d client <host>' % sys.argv[0]
        sys.exit(2)

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<div dir=3D"ltr"><div><div style>For the life of me I cant figure out why t=
his exception is being thrown.=A0</div><div style>How could I use pdb to de=
bug this?=A0</div><div><br></div><div>$ python udp_local2.py server</div><d=
iv>

=A0 File &quot;udp_local2.py&quot;, line 36</div><div>=A0 =A0 except:</div>=
<div>=A0 =A0 =A0 =A0 =A0^</div><div>SyntaxError: invalid syntax</div></div>=
<div><br></div><div><br></div><div>#!/usr/bin/env python</div><div><br></di=
v><div>import random, socket, sys</div>

<div>s =3D socket.socket(socket.AF_INET, socket.SOCK_DGRAM)</div><div><br><=
/div><div>MAX =3D 65535</div><div>PORT =3D 1060</div><div><br></div><div>if=
 2 &lt;=3D len(sys.argv) &lt;=3D 3 and sys.argv[1] =3D=3D &#39;server&#39;:=
</div><div>

=A0 =A0 interface =3D sys.argv[2] if len(sys.argv) &gt; 2 else &#39;&#39;</=
div><div>=A0 =A0 s.bind((interface, PORT))</div><div>=A0 =A0 print &#39;Lis=
tening at&#39;, s.getsockname()</div><div>=A0 =A0 while True:</div><div>=A0=
 =A0 =A0 =A0 data, address =3D s.recvfrom(MAX)</div>

<div>=A0 =A0 =A0 =A0 if random.randint(0, 1):</div><div>=A0 =A0 =A0 =A0 =A0=
 =A0 print &#39;The client at&#39;, address, &#39;says:&#39;, repr(data)</d=
iv><div>=A0 =A0 =A0 =A0 =A0 =A0 s.sendto(&#39;Your data was %d bytes&#39; %=
 len(data), address)</div><div>

=A0 =A0 =A0 =A0 else:</div><div>=A0 =A0 =A0 =A0 =A0 =A0 print &#39;Pretendi=
ng to drop packet from&#39;, address</div><div><br></div><div>elif len(sys.=
argv) =3D=3D 3 and sys.argv[1] =3D=3D &#39;client&#39;:</div><div>=A0 =A0 h=
ostname =3D sys.argv[2]</div>
<div>
=A0 =A0 s.connect((hostname, PORT))</div><div>=A0 =A0 print &#39;Client soc=
ket name is&#39;, s.getsockname()</div><div>=A0 =A0 delay =3D 0.1</div><div=
>=A0 =A0 while True:</div><div>=A0 =A0 =A0 =A0 s.send(&#39;This is another =
message&#39;)</div><div>

=A0 =A0 =A0 =A0 print &#39;Waiting up to&#39;, delay, &#39;seconds for a re=
ply&#39;</div><div>=A0 =A0 =A0 =A0 s.settimeout(delay)</div><div>=A0 =A0 =
=A0 =A0 try:</div><div>=A0 =A0 =A0 =A0 =A0 =A0 data =3D s.recv(MAX)</div><d=
iv>=A0 =A0 =A0 =A0 except socket.timeout:</div>

<div>=A0 =A0 =A0 =A0 =A0 =A0 delay *=3D 2</div><div>=A0 =A0 =A0 =A0 =A0 =A0=
 if delay &gt; 2.0:</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 raise Runtime=
Error(&#39;I think the server is down&#39;)</div><div>=A0 =A0 =A0 =A0 =A0 =
=A0 except:</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 raise</div><div>

=A0 =A0 =A0 =A0 =A0 =A0 else:</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 bre=
ak</div><div>=A0 =A0 =A0 =A0 print &#39;The server says&#39;, repr(data)</d=
iv><div>=A0 =A0 else:</div><div>=A0 =A0 =A0 =A0 print &gt;&gt; sys.stderr, =
&#39;usage: %d server [&lt;interfae&gt;]&#39; % sys.argv[0]</div>

<div>=A0 =A0 =A0 =A0 print &gt;&gt; sys.stderr, &#39; =A0 or: %d client &lt=
;host&gt;&#39; % sys.argv[0]</div><div>=A0 =A0 =A0 =A0 sys.exit(2)</div><di=
v><br></div><div><br></div></div>

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