Definition errors in lambda functions in embedded shells

[amelio-vazquez-reina]

Say I define a shell to debug my code from IPython:

from IPython.terminal.embed import InteractiveShellEmbed
ipshell = InteractiveShellEmbed(config=cfg, banner1=banner_msg, exit_msg=exit_msg)

def ipsh():
   frame = inspect.currentframe().f_back
   msg = 'Stopped at {0.f_code.co_filename} at line {0.f_lineno}'.format(frame)
   ipshell(msg,stack_depth=2) # Go back one level!

I use it by leaving ipsh() anywhere in my code where I want to drop down into an IPython shell, i.e.

# code I want to debug/inspect
# ....
ipsh()
# code I want to debug/inspect
# ....

Once I am in this embedded shell, if I do the following:

ci = 50
f = lambda x: np.percentile(x, 100-ci)
f([20,40,60, 80, 100])

I get the error:
NameError: global nameciis not defined. This error doesn't happen if I run the snippet above from a regular IPython shell.

The above is with the latest stable version of IPython and Python (Python 2.7.x).

[takluyver]

Thanks - I think this is the same as issue #136. There's more discussion there, but in short: it's a limitation of Python's execution model, but there may be a way we can work around it.