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

I was also interested in a __LINE__ command in python. My starting point was https://stackoverflow.com/a/6811020 and I extended it with a metaclass object. With this modification it has the same behavior like in C++.

import inspect

class Meta(type):
    def __repr__(self):
        # Inspiration: https://stackoverflow.com/a/6811020
        callerframerecord = inspect.stack()[1]  # 0 represents this line
        # 1 represents line at caller
        frame = callerframerecord[0]
        info = inspect.getframeinfo(frame)
        # print(info.filename)  # __FILE__     -> Test.py
        # print(info.function)  # __FUNCTION__ -> Main
        # print(info.lineno)  # __LINE__     -> 13
        return str(info.lineno)

class __LINE__(metaclass=Meta):
    pass

print(__LINE__)  # print for example 18