def col (loc, strg):
    """Returns current column within a string, counting newlines as line separators.
   The first column is number 1.

   Note: the default parsing behavior is to expand tabs in the input string
   before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
   on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
   consistent view of the parsed string, the parse location, and line and column
   positions within the parsed string.
   """
    return (loc<len(strg) and strg[loc] == '\n') and 1 or strg.rfind("\n", 0, loc) - loc
dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/pyparsing.py/col/swapped operands of `-`