Kent Johnson wrote:
> Bill Campbell wrote:
>
>>Is there a way in python for a method to determine its parent?
>>
>>In particular, I'm working with SimpleXMLRPCServer, and would
>>like to be able to find the client_address in the routine that
>>has been dispatched. I know that client_address is an attribute
>>of the handler class instance, but don't know how to get to that.
>
>
> You can inspect the stack frame to find this out. Search the online cookbook
> for _getframe - I don't see one recipe that does exactly what you want but
> the pieces are there.
> http://aspn.activestate.com/ASPN/Cookbook/Python
OK here is a simple module that shows callers on the stack.
import sys
def showFrame(f):
print 'Name =', f.f_code.co_name
for k, v in f.f_locals.iteritems():
print ' ', k, '=', v
print
def whereAmI():
i=1
while True:
try:
f = sys._getframe(i)
showFrame(f)
i += 1
except ValueError:
break
if __name__ == '__main__':
def foo(a):
bar = 'baz'
zap = 3
whereAmI()
def bar():
foo(3)
bar()
When I run this it prints
Name = foo
a = 3
bar = baz
zap = 3
Name = bar
Name = ?
bar = <function bar at 0x008E9070>
showFrame = <function showFrame at 0x008E0A30>
__builtins__ = <module '__builtin__' (built-in)>
__file__ = F:\Tutor\ShowStack.py
sys = <module 'sys' (built-in)>
whereAmI = <function whereAmI at 0x008E08B0>
__name__ = __main__
foo = <function foo at 0x008E9030>
__doc__ = Show stuff from the stack frame
HOWEVER, I don't think this is a good solution to your problem - it's quite a
fragile hack. Better would be to find a way to pass the information you need to
your function. For example, from a quick look at the code for
SimpleXMLRPCServer, it looks like you could subclass SimpleXMLRPCServer and
make your own _dispatch() method that adds client_address to the parameter
list, then all your functions would be passed the client_address. Or even
specialize it so that just one special function gets this treatment.
Kent
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