human
Solve the following python programming problem given the following code:
def pack_list(from_, pack_type) : 
    ' Return the wire packed version of `from_`. `pack_type` should be some
    subclass of `xcffib.Struct`, or a string that can be passed to
    `struct.pack`. You must pass `size` if `pack_type` is a struct.pack string.
    ' 
    if (len (from_) == 0) : 
        return bytes () 
if (pack_type == 'c') : 
        if isinstance (from_, bytes) : 
            from_ = [six.int2byte (b) for b in six.iterbytes (from_)] 
else : 
            if isinstance (from_, six.string_types) : 
                from_ = [six.int2byte (b) for b in bytearray (from_, 'utf-8')] 
else : 
                if isinstance (from_ [0], six.integer_types) : 
                    def to_bytes(v) : 
                        for _ in range (4) : 
                            (v, r) = divmod (v, 256) 
                            (yield r) 
from_ = [six.int2byte (b) for i in from_ for b in to_bytes (i)] 
if isinstance (pack_type, six.string_types) : 
        return struct.pack (('=' + (pack_type * len (from_))), * buf) 
else : 
        buf = six.BytesIO () 
        for item in from_ : 
            if (isinstance (item, Protobj) and hasattr (item, 'pack')) : 
                buf.write (item.pack ()) 
else : 
                buf.write (item) 
return buf.getvalue () 

    
    

    Fix the buggy line: return struct.pack (('=' + (pack_type * len (from_))), * buf)
assistant
#Here is Python program to fix the buggy line: return struct.

return struct.pack (('=' + (pack_type * len (from_))), * from_)