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51.

Write a Python script that display first ten Mersenne numbers. Mersenne number are in the form of 2n-1

Answer»

def Mersenne (n):

return 2**n-1

print “First ten Mersenne numbers are :”

for a in range (1,11):

print Mersenne (a)
Discussion
52.

Create a function doubleFactorial(n) that takes an odd integer and returns the product of all odd values upto the value n (where n=2k-l).

Answer»

def doubleFactorial(num):

product = 1

i = 0

k = 0

while k <num:

k = 2*i+l

product * = k

i += 1

return product
Discussion
53.

Create a function factorial(x) that takes an integer and returns the product of all the positive integers less than or equal to n.

Answer»

def factorial(num):

product =1

i = num

while i > 0:

product *=i

i-=l

return product
Discussion
54.

Write Python script to print the following pattern11     11     1     11     1     1      11     1     1      1     1

Answer»

n = 1

for a in range (5) :

print n

n = n *10 + 1
Discussion
55.

Write Python script to calculate sum of following series :s = (1) + (1+2) + (1+2+3) +…+ (1+2+3+…+n)

Answer»

sum 0

n = int (raw_input (“Enter the value of n :”)]

for a in range (2, n+2):

term = 0

for b in range (1,1):

term + = b

print “Term”, (a-1), “:”,term

sum + = term

print “Sum of”, n, “term is”, sum
Discussion
56.

Create a function add Numbers(x) that takes a number as an argument and adds all the integers between 1 and the number (inclusive) and returns the total number.

Answer»

def add Numbers (num):

total = 0

i = 1

while i< = num:

total + = i

i+ = 1

return total
Discussion
57.

Which numbers are printed?for i in range(2):print ifor i in range(4,6):print i

Answer»

0,1,4,5 number are printed.
Discussion
58.

Does Python support “switch” statements?

Answer»

No, Python does not currently support switch or case statements as in other languages.
Discussion
59.

What is a statement ? What is the significance of an empty statement ?

Answer»

A statement is an instruction given to the computer to perform any kind of action. An empty statement is useful in situations where the code requires a statement but does not require logic. To fill these two requirements simultaneously, an empty statement is used. Python offers a‘pass’ statement as an empty statement.
Discussion
60.

What is the difference between determinable loop and non-determinable loop ?

Answer»

The ‘for loop’ can be labeled as ‘determinable Ans. Value of expression is 100 Goodbye! loop’ as number of its iterations can be determined before-hand as the size of the sequence, it is operating upon. 

The ‘while loop’ can be ‘non-determined loop’ as its number of iterations cannot be determined before-hand. Its iterations depend upon the result of a test condition, which cannot be determined before-hand.
Discussion