[Tutor] How can a function know where it was called from
alan.gauld at freenet.co.uk
Thu Mar 2 12:25:38 CET 2006
> I want myfunction in the pseudocode below return something
> different if it was called from indexfunction.
There are several approaches to this.
> def indexfunction(): blah
> def myfunction():
> if <myfunction was called from indexfunction>: return x
> else: return <header> + x + <footer>
The simplest approach simply includes a "sender" parameter in
myfunction and callers supply a link or label to indicate who is
calling. This is the approach adopted by many GUI toolkits.
It works best if you want to identify an object rather than a
function however since the caller simply passes self as the value.
The other possibility is to use the traceback module and
examine the call stack. Thats a moderately advanced technique
and you may want to google for some examples of using tracebacks.
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