Accessing run stack traces inside post_execute event handler

[Sudarshan Raghunathan]

I am writing a "post_execute" event handler that looks something like this:
class MyEventHandler(object):
    def __init__(self, ip):
        self.shell = ip
       
    def post_execute(self):
        ec = self.shell.execution_count
        print("post execute: \nIn = %s\nOut = %s"%(self.shell.user_ns["In"][ec], self.shell.user_ns["Out"].get(ec, None)))

def load_ipython_extension(ip):
    eh = MyEventHandler(ip)
    ip.events.register("post_execute", eh.post_execute)

It works as expected when a cell runs successfully. However, when a cell fails with an exception, I could not find any way to get to the stack-trace that was generated. Is this possible somehow?

Thank you in advance!

[Thomas Kluyver]

I don't think it's currently possible. Do you want to file an issue on ipython/ipython to request it?

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[Sudarshan Raghunathan]

Thanks, filed an issue here: https://github.com/ipython/ipython/issues/10702

If you are able to provide me with some high-level guidance on how to implement this feature in run_cell, I will be more than happy to send a PR with the changes. For my own use-case, I don't need any changes to HistoryManager. In fact, I can just store an additional field parallel to last_execution_succeeded. However, I don't know if this is necessarily the best long-term option.

Please let me know and thanks again for your help.

On Friday, July 14, 2017 at 10:14:30 AM UTC-4, takowl wrote:

I don't think it's currently possible. Do you want to file an issue on ipython/ipython to request it?

On 13 July 2017 at 22:05, Sudarshan Raghunathan <rdar...@gmail.com> wrote:

I am writing a "post_execute" event handler that looks something like this:
class MyEventHandler(object):
    def __init__(self, ip):
        self.shell = ip
       
    def post_execute(self):
        ec = self.shell.execution_count
        print("post execute: \nIn = %s\nOut = %s"%(self.shell.user_ns["In"][ec], self.shell.user_ns["Out"].get(ec, None)))

def load_ipython_extension(ip):
    eh = MyEventHandler(ip)
    ip.events.register("post_execute", eh.post_execute)

It works as expected when a cell runs successfully. However, when a cell fails with an exception, I could not find any way to get to the stack-trace that was generated. Is this possible somehow?

Thank you in advance!

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