human
Solve the following python programming problem given the following code:
def _build_preprocessed_function(func, processors, args_defaults, varargs, varkw) : 
    '
    Build a preprocessed function with the same signature as `func`.

    Uses `exec` internally to build a function that actually has the same
    signature as `func.
    ' 
    format_kwargs = { 
        'func_name' : func.__name__, 
} 
    def mangle(name) : 
        return (('a' + uuid4 ().hex) + name) 
format_kwargs ['mangled_func'] = mangled_funcname = mangle (func.__name__) 
    def make_processor_assignment(arg, processor_name) : 
        template = "{arg} = {processor}({func}, '{arg}', {arg})" 
        return template.format (arg = arg, processor = processor_name, func = mangled_funcname) 
exec_globals = { 
        mangled_funcname : func, 
        'wraps' : wraps, 
} 
    defaults_seen = 0 
    default_name_template = (('a' + uuid4 ().hex) + '_%d') 
    signature = [] 
    call_args = [] 
    assignments = [] 
    star_map = { 
        varargs : '*', 
        varkw : '**', 
} 
    def name_as_arg(arg) : 
        return (star_map.get (arg, '') + arg) 
for (arg, default) in args_defaults : 
        if (default is NO_DEFAULT) : 
            signature.append (name_as_arg (arg)) 
else : 
            default_name = (default_name_template % defaults_seen) 
            exec_globals [default_name] = default 
            signature.append ('='.join ([name_as_arg (arg), default_name])) 
            defaults_seen += 1 
if (arg in processors) : 
            procname = mangle (('_processor_' + arg)) 
            exec_globals [procname] = default_name [arg] 
            assignments.append (make_processor_assignment (arg, procname)) 
call_args.append (name_as_arg (arg)) 
exec_str = dedent ('        @wraps({wrapped_funcname})
        def {func_name}({signature}):
            {assignments}
            return {wrapped_funcname}({call_args})
        ').format (func_name = func.__name__, signature = ', '.join (signature), assignments = '
    '.join (assignments), wrapped_funcname = mangled_funcname, call_args = ', '.join...

    
    

    Fix the buggy line: exec_globals [procname] = default_name [arg]
assistant
#Here is Python code to fix the buggy line: exec_globals [procname] = default_name [arg]
.

exec_globals [procname] = processors [arg]