@__init<EOL>def init_default_cb():
global default_cb<EOL>nlcb = os.environ.get('<STR_LIT>', '<STR_LIT>').lower()<EOL>if not nlcb:<EOL><INDENT>return<EOL><DEDENT>if nlcb == '<STR_LIT:default>':<EOL><INDENT>default_cb = NL_CB_DEFAULT<EOL><DEDENT>elif nlcb == '<STR_LIT>':<EOL><INDENT>default_cb = NL_CB_VERBOSE<EOL><DEDENT>elif nlcb == '<STR_LIT>':<EOL><INDENT>default_cb = NL_CB_DEBUG<EOL><DEDENT>else:<EOL><INDENT>_LOGGER.warning('<STR_LIT>')<EOL><DEDENT>
https://github.com/thom311/libnl/blob/libnl3_2_25/lib/socket.c#L42.