What would be the output of following code if

ntpl = ("Hello", "Nita", "How's", "life?")
(a, b, c, d) = ntpl
print ("a is:", a)
print ("b is:", b)
print ("c is:", c)
print ("d is:", d)
ntpl = (a, b, c, d)
print(ntpl[0][0]+ntpl[1][1], ntpl[1])

Output

a is: Hello  
b is: Nita
c is: How's  
d is: life? 
Hi Nita    

Explanation

ntpl is a tuple containing 4 elements. The statement (a, b, c, d) = ntpl unpacks the tuple ntpl into the variables a, b, c, d. After that, the values of the variables are printed.

The statement ntpl = (a, b, c, d) forms a tuple with values of variables a, b, c, d and assigns it to ntpl. As these variables were not modified, so effectively ntpl still contains the same values as in the first statement.

ntpl[0] ⇒ "Hello"
∴ ntpl[0][0] ⇒ "H"

ntpl[1] ⇒ "Nita"
∴ ntpl[1][1] ⇒"i"

ntpl[0][0] and ntpl[1][1] concatenates to form "Hi". Thus ntpl[0][0]+ntpl[1][1], ntpl[1] will return "Hi Nita ".