log caller - Python

On Jun 27, 2:42 pm, Matthew Peter <survivedsu...@yahoo.com> wrote:
> Is it possible to print the function calls to a module? Like:
>
> test.py
> import mymod
> print mymod.x()
>
> mymod.py
> # each time a function is called we print out the called function and module
> print 'Func call: %s from %s' % (???, ???)
>
> def x():
> return 'hello'
>
> Where would I pick up the ??? variables? A brief example would be nice too Thanks
> in advance!



You can use a decorator to wrap the function. You can use
sys._getframe or
inspect.stack to get information about the caller. The examples from
the decorator module are very useful:

http://www.phyast.pitt.edu/~micheles...mentation.html

If for some reason you can't edit mymod.py to add the decorators, you
can still wrap the function:

import mymod
import inspect

try:
from functools import update_wrapper
except ImportError:
def decorator_trace(f):
def newf():
caller = inspect.stack()[1]
print 'Caller is line %d of %s' % (caller[2], caller[1])
print 'Calling: %s from %s' % (f.__name__, f.__module__)
return f()
newf.__name__ = f.__name__
newf.__dict__.update(f.__dict__)
newf.__doc__ = f.__doc__
newf.__module__ = f.__module__
return newf
else:
def decorator_trace(f):
def newf():
caller = inspect.stack()[1]
print 'Caller is line %d of %s' % (caller[2], caller[1])
print 'Calling: %s from %s' % (f.__name__, f.__module__)
return f()
return update_wrapper(newf, f)


mymod.x = decorator_trace(mymod.x)
greetings = mymod.x()
print greetings


but this approach has the shortcoming mentioned in the article.

--
Hope this helps,
Steven