Injecting code into a function

[Kay Schluehr]

George Sakkis wrote:
> > Oh, I overlooked this. Then the solution becomes simple:
> >
> >    sys._getframe().f_trace
> >
> > Test:
> >
> > >>> an = Analyzer()
> > >>> sys.settrace(an.trace_returns)
> > >>> sys._getframe().f_trace
> > <bound method Analyzer.trace_returns of <__main__.Analyzer instance
> at
> > 0x010015D0>>
>
> Does this work for you non-interactively ? I tried running it from a
> script or importing it from a module but it returns None. Very
> strange...
>
> George

You are right. The expression was context-dependent :-/

I had not yet the time to analyze the output of the following function
but it returns stable values:

def gettracefunc():
    import sys
    i = 0
    while 1:
        try:
            f_trace = sys._getframe(i).f_trace
            if f_trace:
                return f_trace
            i+=1
        except ValueError:
            break

Ciao,
Kay