Are nested if-else are allowed in Python?

Which is used to define a block in Python?

Syntax of default constructor

Find the output of the following code:

>>> str='Hello\nWorld'

>>> str

 If return statement is not used inside the function, the function will return: 

what will be the output of the following program?

print (20+5.1*2+(16/2*2))/31.0

Which predefined Python function is used to find the length of the string?

What will be the output of the following Python statement?

>>>print('new' 'line')

What will be the output of the following Python code?

a = [13, 56, 17]
a.append([87])
a.extend([45, 67])
print(a)

 What does the function math.frexp(x) return?