Question

I want to know if there would be a way to catch exceptions inside called methods.

Example:

def foo(value):
    print value

foo(x)

This would throw a NameError exception, because x is not declared.
I’d like to catch this NameError exception inside foo method.
Is there a way?

Answer 1

Not exactly, but there is a way to catch every exception that isn’t handled:

>>> import sys
>>> 
>>> def handler(type, value, traceback):
>>>     print "Blocked:", value
>>> sys.excepthook = handler
>>> 
>>> def foo(value):
>>>     print value
>>> 
>>> foo(x)
Blocked: name 'x' is not defined

Unfortunately, sys.excepthook is only called “just before the program exits,” so you can’t return control to your program, much less insert the exception into foo().