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Backport PR #2223: Custom tracebacks...
Backport PR #2223: Custom tracebacks Rather than special casing IPython.parallel errors (which led to issue #2221), this adds a simple API where exception classes can offer a custom traceback, by defining a `_render_traceback_(self)` method. It also adds some documentation on how third parties can integrate packages with IPython. 'Configuration & customisation' seemed the most natural home for this. We should remember to close #2221 when we merge this - I forgot to put it in a commit message.

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embed3.py
7 lines | 336 B | text/x-python | PythonLexer
"""This tests passing local_ns and global_ns (for backwards compatibility only)
at activation of an embedded shell."""
from IPython.frontend.terminal.embed import InteractiveShellEmbed
user_ns = dict(cookie='monster')
ISE = InteractiveShellEmbed(banner1='check cookie in locals, and globals empty')
ISE(local_ns=user_ns, global_ns={})