A problem about ipython

[Vincent Ren]

Hey, everyone, I'm trying to use ipython recently. It's very nice,
however, when I run this(from Programming Python 3rd) in ipython, I'll
get a NameError:


In [1]: import settime, timer, set

In [2]: import profile

In [3]: profile.run('timer.test(100, settime.setops, set.Set)')
---------------------------------------------------------------------------
NameError Traceback (most recent call
last)

/home/vincent/hacking/python/<ipython console> in <module>()

/usr/lib/python2.6/profile.pyc in run(statement, filename, sort)
68 prof = Profile()
69 try:
---> 70 prof = prof.run(statement)
71 except SystemExit:
72 pass

/usr/lib/python2.6/profile.pyc in run(self, cmd)
454 import __main__
455 dict = __main__.__dict__
--> 456 return self.runctx(cmd, dict, dict)
457
458 def runctx(self, cmd, globals, locals):

/usr/lib/python2.6/profile.pyc in runctx(self, cmd, globals, locals)
460 sys.setprofile(self.dispatcher)
461 try:
--> 462 exec cmd in globals, locals
463 finally:
464 sys.setprofile(None)

/usr/lib/pymodules/python2.6/IPython/FakeModule.pyc in <module>()

NameError: name 'timer' is not defined



But when I use normal python shell, it works well
^P^P 675906 function calls in 16.961 CPU seconds

Ordered by: standard name

ncalls tottime percall cumtime percall
filename:lineno(function)
118500 1.144 0.000 1.144 0.000 :0(append)
2 0.000 0.000 0.000 0.000 :0(clock)
500 0.008 0.000 0.008 0.000 :0(range)
1 0.004 0.004 0.004 0.004 :0(setprofile)
1 0.000 0.000 16.957 16.957 <string>:1(<module>)
0 0.000 0.000 profile:0(profiler)
1 0.000 0.000 16.961 16.961 profile:
0(timer.test(100, settime.setops, set.Set))
1500 0.380 0.000 2.504 0.002 set.py:13(union)
3400 0.076 0.000 2.632 0.001 set.py:2(__init__)
3400 1.620 0.000 2.556 0.001 set.py:20(concat)
544000 5.940 0.000 5.940 0.000 set.py:26(__getitem__)
1500 0.060 0.000 14.041 0.009 set.py:27(__and__)
1500 0.060 0.000 2.564 0.002 set.py:28(__or__)
1500 7.564 0.005 13.981 0.009 set.py:6(intersect)
100 0.100 0.001 16.953 0.170 settime.py:4(setops)
1 0.004 0.004 16.957 16.957 timer.py:1(test)



What's going wrong here?


Regards
Wenshan Ren

 

[Robert Kern]

Hey, everyone, I'm trying to use ipython recently. It's very nice,
however, when I run this(from Programming Python 3rd) in ipython, I'll
get a NameError:


In [1]: import settime, timer, set

In [2]: import profile

In [3]: profile.run('timer.test(100, settime.setops, set.Set)')
---------------------------------------------------------------------------
NameError Traceback (most recent call
last)

/home/vincent/hacking/python/<ipython console> in<module>()

/usr/lib/python2.6/profile.pyc in run(statement, filename, sort)
68 prof = Profile()
69 try:
---> 70 prof = prof.run(statement)
71 except SystemExit:
72 pass

/usr/lib/python2.6/profile.pyc in run(self, cmd)
454 import __main__
455 dict = __main__.__dict__
--> 456 return self.runctx(cmd, dict, dict)
457
458 def runctx(self, cmd, globals, locals):

/usr/lib/python2.6/profile.pyc in runctx(self, cmd, globals, locals)
460 sys.setprofile(self.dispatcher)
461 try:
--> 462 exec cmd in globals, locals
463 finally:
464 sys.setprofile(None)

/usr/lib/pymodules/python2.6/IPython/FakeModule.pyc in<module>()

NameError: name 'timer' is not defined

In order to support pickling and its %run feature, IPython makes a fake __main__
module. It looks like profile.run() explicitly imports __main__ to try to run
the statement there. Honestly, it's been a thorn in our side for a long time,
but it's a confusing bit of the code. Most interactive shells actually written
in Python are going to have a similar need to do a workaround, since they
already have a __main__. The regular shell is not written in Python, so it has
no problem.

You will want to ask on the IPython list for future IPython questions.

http://mail.scipy.org/mailman/listinfo/ipython-user

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

 

[Vincent Ren]

In order to support pickling and its %run feature, IPython makes a fake __main__
module. It looks like profile.run() explicitly imports __main__ to try torun
the statement there. Honestly, it's been a thorn in our side for a long time,
but it's a confusing bit of the code. Most interactive shells actually written
in Python are going to have a similar need to do a workaround, since they
already have a __main__. The regular shell is not written in Python, so it has
no problem.

You will want to ask on the IPython list for future IPython questions.

   http://mail.scipy.org/mailman/listinfo/ipython-user

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

Quite nice explanation and very useful link, thanks