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Observe the following Python code?
def a(n): if n == 0: return 0 else: return n*a(n - 1)def b(n, tot): if n == 0: return tot else: return b(n-2, tot-2)
Fill in the line of the following Python code for calculating the factorial of a number.
def fact(num): if num == 0: return 1 else: return _____________________
Is the following Python code valid?
class B(object): def first(self): print("First method called") def second(): print("Second method called")ob = B()B.first(ob)
Which of the following numbers will not be a part of the output list of the following Python code?
def sf(a): return a%3!=0 and a%5!=0m=filter(sf, range(1, 31))print(list(m))
The following Python code is invalid.
class demo(dict): def __test__(self,key): return [
The two snippets of the following Python codes are equivalent.
CODE 1 @fdef f1(): print(“Hello”)CODE 2 def f1(): print(“Hello”)f1 = f(f1)
Pick the correct statements.
I.   The body of a function should have only one return statement.
II.  The body of a function may have many return statements.
III. A function can return only one value to the calling environment.
IV. If return statement is omitted, then the function does its job but returns no value to the calling environment.
Is the following Python code correct?
>>> class A:def __init__(self,b):self.b=bdef display(self):print(self.b)>>> obj=A("Hello")>>> del obj
Identify the decorator in the snippet of code shown below.
def sf(): passsf = mk(sf)@fdef sf(): return
The height of a tree is defined as the number of edges on the longest path in the tree. The function shown in the pseudocode below is invoked as height(root) to compute the height of a binary tree rooted at the tree pointer root. int height (treeptr n) { if (n == NULL) return -1;   if (n →  left == NULL)        if (n →  right == NULL) return 0;        else return ; \(\boxed{B1}\);     // Box 1 else { h1 = height (n →  left);          if (n → right == NULL) return (1+h1);          else { h2 = height (n → right);          return ; \(\boxed{B2}\)   // Box 2                        }            } } The appropriate expressions for the two boxes B1 and B2 are