cProfile from the cli with environ variables as output filenames similar to nvprof

profile.py

# https://github.com/python/cpython/blob/master/Lib/profile.py
def _show(self, prof, filename, sort):
        if filename is not None:
            # NOTE(hvy): Replace environment variables similar to how
            # nvprof does by e.g. replacing out_%q{MV2_COMM_WORLD_RANK} with
            # out_1, out_2, etc. depending on the value of the variable
            # MV2_COMM_WORLD_RANK
            import re
            if re.search(r'\%q{(.*?)\}', filename) is not None:
                filename = re.sub(r'\%q{(.*?)\}',
                                  lambda match: os.environ[match.group(1)],
                                  filename)
                
            prof.dump_stats(filename)
        else:
            prof.print_stats(sort)