Get cursor position, based on previous newline

def find_column(t):
    """Get cursor position, based on previous newline"""
    pos = t.lexer.lexpos
    data = t.lexer.lexdata
    last_cr = data.rfind('\n', 0, pos)
    if last_cr < 0:
        last_cr = -1
    column = pos - last_cr
    return column