log caller

[Matthew Peter]

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!



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[attn.steven.kuo]

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/python/documentation.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.