a = [0, 1, 2, 3]
for a[0] in a:
    print(a[0])

class Demo:
    def __init__(self):
        self.a = 1
        self.__b = 1
 
    def display(self):
        return self.__b
 
obj = Demo()
print(obj.__b)

X = 2+9*((3*12)-8)/10

re.split(r'(a)(t)', 'Maths is a difficult subject')

aTuple = (100, 200, 300, 400, 500)
aTuple[1] = 800
print(aTuple)

class A: 
   def __init__(self, i=100): 
      self.i=i 
class B(A): 
   def __init__(self,j=0): 
      self.j=j 
def main(): 
   b= B() 
   print(b.i) 
   print(b.j) 
main()

a = ['hat', 'mat', 'rat']
'rhyme'.join(a)

class Count:
   def __init__(self, count=0):
      self.__count=count
a=Count(2)
b=Count(2)
print(id(a)==id(b), end = '' '')

c= ''hello''
d= ''hello''
print(id(c)==id(d))

first = bool('False')
second = bool()
print(str(first) + " " + str(second))