Python (pdb) - Queueing up commands to execute

Question

I am implementing a "breakpoint" system for use in my Python development that will allow me to call a function that, in essence, calls pdb.set_trace();

Some of the functionality that I would like to implement requires me to control pdb from code while I am within a set_trace context.

Example:

disableList = [] def breakpoint(name=None): def d(): disableList.append(name) #**** #issue 'run' command to pdb so user #does not have to type 'c' #**** if name in disableList: return print "Use d() to disable breakpoint, 'c' to continue" pdb.set_trace();

In the above example, how do I implement the comments demarked by the #**** ?

In other parts of this system, I would like to issue an 'up' command, or two sequential 'up' commands without leaving the pdb session (so the user ends up at a pdb prompt but up two levels on the call stack).

Alex Morega · Accepted Answer · 2010-04-08 11:38:30Z

You could invoke lower-level methods to get more control over the debugger:

def debug(): import pdb import sys # set up the debugger debugger = pdb.Pdb() debugger.reset() # your custom stuff here debugger.do_where(None) # run the "where" command # invoke the interactive debugging prompt users_frame = sys._getframe().f_back # frame where the user invoked `debug()` debugger.interaction(users_frame, None) if __name__ == '__main__': print 1 debug() print 2

You can find documentation for the pdb module here: http://docs.python.org/library/pdb and for the bdb lower-level debugging interface here: http://docs.python.org/library/bdb. You may also want to look at their source code.

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