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#!/usr/bin/env python3
from typing import Callable
def function_identifier(f: Callable) -> str:
"""
Given a callable function, return a string that identifies it.
Usually that string is just __module__:__name__ but there's a
corner case: when __module__ is __main__ (i.e. the callable is
defined in the same module as __main__). In this case,
f.__module__ returns "__main__" instead of the file that it is
defined in. Work around this using pathlib.Path (see below).
>>> function_identifier(function_identifier)
'function_utils:function_identifier'
"""
if f.__module__ == '__main__':
from pathlib import Path
import __main__
module = __main__.__file__
module = Path(module).stem
return f'{module}:{f.__name__}'
else:
return f'{f.__module__}:{f.__name__}'
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