human
Solve the following python programming problem given the following code:
def dotrace(* args, **kwds) : 
    "Function decorator to trace a function's entry and exit.

    *args: categories in which to trace this function. Example usage:

    @trace
    def function(...):...

    @trace('mycategory')
    def function(...):...

    " 
    recursive = kwds.get ('recursive', False) 
    def decorator(func) : 
        spec = None 
        logger = logging.getLogger ('trace') 
        def wrapper(* args, **kwds) : 
            if ((not logger.isEnabledFor (logging.INFO)) or tls.tracing) : 
                return func (* args, ** kwds) 
(fname, ftype) = find_function_info (func, spec, args) 
            try : 
                tls.tracing = True 
                (enter, leave) = create_events (fname, spec, args, kwds) 
                try : 
                    logger.info (''.join (enter)) 
                    tls.indent += 1 
                    try : 
                        try : 
                            tls.tracing = False 
                            result = func (* args, ** kwds) 
finally : 
                            tls.tracing = True 
except : 
                        (type, value, traceback) = sys.exc_info () 
                        leave.append (' => exception thrown
\traise ') 
                        mname = type.__module__ 
                        if (mname != '__main__') : 
                            leave.append (mname) 
                            leave.append ('.') 
leave.append (type.__name__) 
                        if value.args : 
                            leave.append ('(') 
                            leave.append (', '.join ((chop (v) for v in value.args))) 
                            leave.append (')') 
else : 
                            leave.append ('()') 
raise 
else : 
                        if (result is not None) : 
                            leave.append (' -> ') 
                            leave.append (chop (result)) 
finally : 
                    tls.indent -= 1 
                    logger.info (''.join (leave)) 
finally : 
         ...

    
    

    Fix the buggy line: arg0 = ((len (args) and decorator [0]) or None)
assistant
#Here is Python program to fix the buggy line: arg0 = ((len (args) and decorator [0]) or None)
.

arg0 = ((len (args) and args [0]) or None)