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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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ipython_config.py
19 lines | 518 B | text/x-python | PythonLexer
c = get_config()
app = c.InteractiveShellApp
# This can be used at any point in a config file to load a sub config
# and merge it into the current one.
load_subconfig('ipython_config.py', profile='default')
lines = """
from IPython.parallel import *
"""
# You have to make sure that attributes that are containers already
# exist before using them. Simple assigning a new list will override
# all previous values.
if hasattr(app, 'exec_lines'):
app.exec_lines.append(lines)
else:
app.exec_lines = [lines]