2012-05-07 04:16, Kjetil brinchmann Halvorsen skrev:
Do you use anything that may affect sage's ability to open ports?
My problem with answering is that I don't really know anything about
"ports" . I guess that has something to do with networking,
but nbothing more! Any hints about books/papers/netplaces to read to
learn about "ports"?
This problem is probably beyond me, but someone else might answer, and
you have the other thread going on the same problem. I do not expect
that the text below will solve your problem, but perhaps it helps you
understand the error message better:
My (possibly incorrect) intuition about ports:
We have networking and we need a way to organize the programs that want
to connect to the network. Let's imagine that the network card has 2^16
different "connection points" that the programs can connect to, and
let's call them ports. When a program connects to another (on the same
or a different machine), it needs to communicate with a port, and the
responding program needs to "listen" to that port. As an example, my web
server listens to incoming requests from others, and it does so on port
80. Thus if you want to see on of the web pages it serves, you send a
request to that computer, and send it to port 80 on that computer. This
also works for local networking, it does not matter if the request to
port 80 came from the outside or from another program running on the
same machine.
The sage notebook runs in a web server, and you connect to it locally
(or remotely if the notebook is configured to respond to requests from
other machines, which it is probably not, for security purposes.
You can see some info about open ports by running "netstat -t -p". My
sage notebook runs on port 8000.
One example output line of the netstat command is
tcp 0 0 johan-laptop.loca:36666 87.117.201.130:ircd ESTABLISHED
28025/xchat-gnome
Saying that I have a tcp port open (there are two kinds, tcp and udp and
sage uses tcp), from my local machine, port 36666 to 87.117.201.130 port
ircd (I assume this indicated the standard port for an irc client) and
the port was opened by the program xchat-gnome.
The wikipedia page is at
<http://en.wikipedia.org/wiki/Port_%28computer_networking%29>
kjetil@kjetil:~/sage/sage-5.0.rc0$ ./sage --ipython
WARNING: Configuration file ipythonrc not found. Ignoring request.
------------------------------------------------------------
Traceback (most recent call last):
File
"/home/kjetil/sage/sage-5.0.rc0/local/lib/python2.7/site-packages/IPython/ConfigLoader.py",
line 66, in load
fname = filefind(fname,incpath)
File
"/home/kjetil/sage/sage-5.0.rc0/local/lib/python2.7/site-packages/IPython/genutils.py",
line 554, in filefind
' not found in current or supplied directories:' + `alt_dirs`
IOError: File'ipythonrc' not found in current or supplied
directories:u'/home/kjetil/.ipython'
WARNING: Problems loading configuration file 'ipythonrc'
Starting with default -bare bones- configuration.
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
/home/kjetil/sage/sage-5.0.rc0/local/lib/python2.7/site-packages/IPython/ipmaker.pyc
in force_import(modname, force_reload)
61 reload(sys.modules[modname])
62 else:
---> 63 __import__(modname)
64
65
ImportError: Bad magic number in /home/kjetil/.ipython/ipy_user_conf.pyc
WARNING: /home/kjetil/.ipython/ipy_user_conf.py does not exist, please
run %upgrade!
WARNING: Loading of ipy_user_conf failed.
Python 2.7.2 (default, May 3 2012, 22:40:27)
Type "copyright", "credits" or "license" for more information.
IPython 0.10.2 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.
In [1]: 3**33
Out[1]: 5559060566555523
In [2]:
From what Keshav said, this appears rather harmless for the
functionality, but a bit annoying. You get a warning, but the thing
tested actually works.
As all tests pass for my wheezy, let me know if there is anything I can
do to see where we differ. I do have ipython 0.12 (which is 0.11 or
newer, and I do not get the error.
root@johan-laptop:/home/johan# aptitude show ipython
Paket: ipython
Tillstånd: installerat
Automatiskt installerade: nej
Version: 0.12-1
Regards
Johan
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