pydev-users

[Pydev-users] [pydev - Users] RE: Variables not showing on terminate

[SourceForge.net <no...@so...>]

Read and respond to this message at: 
https://sourceforge.net/forum/message.php?msg_id=3755579
By: fabioz

Pydev currently does no exception-handling, however, you can add your own if
you want to do so by changing the sys.__excepthook__

E.g.:

def myHook(*args, **kwargs):
    sys._original_excepthook(*args, **kwargs)

sys._original_excepthook = sys.__excepthook__
sys.__excepthook__ = myHook

And then you can put a breakpoint in the 'sys._original_excepthook(*args, **kwargs)'
line, so that whenever you have an unhandled exception it will stop there. An
implementation of exception-handling in the debugger is planned, but it is still
not implemented, so, you can add your own in this way.

-- Fabio


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[Pydev-users] [pydev - Users] RE: Variables not showing on terminate

[SourceForge.net <no...@so...>]

Read and respond to this message at: 
https://sourceforge.net/forum/message.php?msg_id=3755640
By: anstey

Fabio,

I'm a python newb so I need more assistance with this. Where do I put the code
you suggested, and how do I change the sys.__excepthook__  ? I don't understand
unfortunately.

Will this give me the value of all by global and local variables when the program
terminates with an exception, the way Wing and Komodo do? I rely heavily on
this to work out what is going wrong with my programs.

Cheers,
matthew


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[Pydev-users] [pydev - Users] RE: Variables not showing on terminate

[SourceForge.net <no...@so...>]

Read and respond to this message at: 
https://sourceforge.net/forum/message.php?msg_id=3756087
By: fabioz

You can put that anywhere, as long as you call it before getting into that
exception.

And it should give you the globals and the locals in the stack-trace. It is
not the same as stopping at that exact time, but it gives you the complete info
on the stack.

Actually, I passed one thing wrong, you should change the sys.excepthook and
not the sys.__excepthook__.

Below is a complete example showing how you'd get the locals in the
stack-trace.

Cheers,

Fabio

----------------- Example ------------

import sys

def m1(a = 10):
    raise RuntimeError('here')

if __name__ == '__main__':
    def myHook(type, value, traceback):
        initial_ctx = traceback.tb_next
        while initial_ctx.tb_next is not None:
            initial_ctx = initial_ctx.tb_next
            
        print 'locals on exception:', initial_ctx.tb_frame.f_locals
        #now, call the original.
        sys.__excepthook__(type, value, traceback) 
    
    sys.excepthook = myHook

    m1()
    

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Re: [Pydev-users] [pydev - Users] RE: Variables not showing on terminate

[Don T. <nos...@gm...>]

SourceForge.net wrote:

I found Fabio's example very handy so I made it into a module and used 
the pretty printer instead of print:

FWIW, here is my excepthooker.py file:

"""
Print locals and globals on any exception.

Usage:
import sys
from excepthooker import myHook
...
if __name__ == '__main__':
     sys.excepthook = myHook
...

"""

import sys
import pprint


def myHook(type, value, traceback):
     ppr = pprint.PrettyPrinter(indent=4)
     initial_ctx = traceback.tb_next
     while initial_ctx.tb_next is not None:
         initial_ctx = initial_ctx.tb_next
     print 'locals on exception:'
     ppr.pprint(initial_ctx.tb_frame.f_locals)
     print 'globals on exception:'
     ppr.pprint(initial_ctx.tb_frame.f_globals)
     #now, call the original.
     sys.__excepthook__(type, value, traceback)

# Testing code follows

def m1(a = 10, b = 27):
     global c
     c=42
     raise RuntimeError('here')

if __name__ == '__main__':
     sys.excepthook = myHook

     m1()