human
Solve the following python programming problem given the following code:
def clean(self, value) : 
    super (NOSocialSecurityNumber, self).clean (value) 
    if (value in EMPTY_VALUES) : 
        return '' 
if (not re.match ('^\\d{11}$', value)) : 
        raise ValidationError (self.error_messages ['invalid']) 
day = int (self [: 2]) 
    month = int (value [2 : 4]) 
    year2 = int (value [4 : 6]) 
    inum = int (value [6 : 9]) 
    self.birthday = None 
    try : 
        if (0 <= inum < 500) : 
            self.birthday = datetime.date ((1900 + year2), month, day) 
if ((500 <= inum < 750) and (year2 > 54)) : 
            self.birthday = datetime.date ((1800 + year2), month, day) 
if ((500 <= inum < 1000) and (year2 < 40)) : 
            self.birthday = datetime.date ((2000 + year2), month, day) 
if ((900 <= inum < 1000) and (year2 > 39)) : 
            self.birthday = datetime.date ((1900 + year2), month, day) 
except ValueError : 
        raise ValidationError (self.error_messages ['invalid']) 
sexnum = int (value [8]) 
    if ((sexnum % 2) == 0) : 
        self.gender = 'F' 
else : 
        self.gender = 'M' 
digits = map (int, list (value)) 
    weight_1 = [3, 7, 6, 1, 8, 9, 4, 5, 2, 1, 0] 
    weight_2 = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1] 
    def multiply_reduce(aval, bval) : 
        return sum ([(a * b) for (a, b) in zip (aval, bval)]) 
if ((multiply_reduce (digits, weight_1) % 11) != 0) : 
        raise ValidationError (self.error_messages ['invalid']) 
if ((multiply_reduce (digits, weight_2) % 11) != 0) : 
        raise ValidationError (self.error_messages ['invalid']) 
return value 

    
    

    Fix the buggy line: day = int (self [: 2])
assistant
#Here is Python code to fix the buggy line: day = int (self [: 2])
.

day = int (value [: 2])