How to determine file, function and line number?

Question

In C++, I can print debug output like this:

printf(
   \"FILE: %s, FUNC: %s, LINE: %d, LOG: %s\\n\",
   __FILE__,
   __FUNCTION__,
   __LINE__,
   logmessage         


        

Answer 1

Building on geowar's answer:

class __LINE__(object):
    import sys

    def __repr__(self):
        try:
            raise Exception
        except:
            return str(sys.exc_info()[2].tb_frame.f_back.f_lineno)

__LINE__ = __LINE__()

If you normally want to use __LINE__ in e.g. print (or any other time an implicit str() or repr() is taken), the above will allow you to omit the ()s.

(Obvious extension to add a __call__ left as an exercise to the reader.)