This is all awesome info; I've got some reading to do! and I can't
believe I didn't try reset!
Thanks! Doug
On Jul 15, 11:30 am, Jason Grout <jason-s...@creativetrax.com> wrote:
> Doug wrote:
> > Two more basic questions I'm hoping you can help with:
>
> > 1. My workstyle so far is to edit my .sage file in emacs and then load
> > it into sage on the command line. Sometimes I want my program to stop
> > in the middle so I can more closely examine/verify what it's doing.
> > I've been inserting a line that just says "stop" to do this and it
> > causes sage/Python to stop with an error message and a short stack
> > trace. This works, but it's kind of messy. "raise Exception
> > ('spam','eggs')" does pretty much the same thing. Is there a way to
> > tell sage/Python to stop running without raising an error?
>
> One thing you can do is use pdb, the python debugger (example
> fromhttp://www.electricmonk.nl/log/2008/06/25/breakpoint-induced-python-d...).
>
> from IPython.Debugger import Tracer; debug_here = Tracer()
>
> def ham():
> x = 5
> debug_here()
> raise NotImplementedError('Use the source, luke!')
>
> ham()
>
> will put you into the python debugging loop, where you can examine
> variables, step through the code, etc. Just put these two lines
> somewhere in your code where you want it to stop. See
> alsohttp://www.nabble.com/debugging-in-ipython-td20047930.htmlfor another
> way to set a breakpoint.
>
> Another way to enter this is to just turn pdb on in Sage (actually ipython):
>
> sage: %pdb on
>
> Now any errors will drop you into the debugger.
>
> And thirdly, you can just wait until an error shows up and type
>
> sage: %debug
>
> to examine the variable values, etc. when that error was thrown.
>
> Fourthly, you can use pdb to run the function directly:
>
> import pdb
> pdb.run('Networks.FindPathLengthsFromNode(g, 0)')
>
> > 2. Is there a way to "reset" sage/Python from the command-line as if I
> > was restarting? I can't even find a command that will clear all my
> > global variables, although that might be enough.
>
> Check out the (oddly enough named :) reset function:
>
> sage: reset?
>
> from the reset docs:
>
> sage: x = 5
> sage: reset()
> sage: x
> x
>
> Thanks,
>
> Jason
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