human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def bad_datas(self, value) : 
    val = (value * 3) 
    def _alter_byte(byte_string, pos) : 
        old_val = indexbytes (byte_string, pos) 
        new_byte = int2byte ((old_val + (1 % 255))) 
        return ((byte_string [: pos] + new_byte) + byte_string [(pos + 1) :]) 
return (_alter_byte (val, i) for i in xrange (len (value))) 

    
    

    Fix the buggy line: return (_alter_byte (val, i) for i in xrange (len (value)))
assistant
#Here is Python program to fix the buggy line: return (_alter_byte (val, i) for i in xrange (len (value)))
.

return (_alter_byte (val, i) for i in xrange (len (val)))