Global variables undefined in interactive use of embedded ipython shell #62
Description
Original Launchpad bug 399627: https://bugs.launchpad.net/ipython/+bug/399627
Reported by: h-fangohr (Hans Fangohr).
The error can be reproduced as follows:
- Start Python, and start embedded ipython session. Following ipython's manual, we do
fangohr@eta:~$ python
Python 2.4.3 (#1, Jun 8 2009, 14:09:06)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from IPython.Shell import IPShellEmbed
>>> ipshell=IPShellEmbed()
>>> ipshell()
Within the just started ipython session, global variables are sometimes not visible. Two examples are:
Example 1:
In [1]: a=1
In [2]: def f(x):
...: return a*x
...:
In [3]: f(2)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/fangohr/<ipython console>
/home/fangohr/<ipython console> in f(x)
NameError: global name 'a' is not defined
Example 2:
In [4]: b=1
In [5]: (lambda :b)()
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/fangohr/<ipython console>
/home/fangohr/<ipython console> in <lambda>()
NameError: global name 'b' is not defined
There is no error if "b=1; (lambda :b)()" is put in a script, and this script is executed using ipython's "run" command.
There is no error if "b=1; (lambda :b)()" is executed interactively after having started ipython.
The only way the error seems comes up is if an embedded IPython shell is started from a Python prompt AND the commands are executed interactively at the prompt.
I find the same error when trying ipython-0.9.1 (with python2.4).
The bug was reported by Olivier Klein to the nmag team (http://nmag.soton.ac.uk).