NPTEL Programming Data Structures And Algorithms Using Python Assignment 2 Answer

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1. One of the following 10 statements generates an error. Which one? (Your answer should be a number between 1 and 10.)

x = [[3,5],"mimsy",2,"borogove",1]  # Statement 1
y = x[0:50]                          # Statement 2
z = y                                # Statement 3
w = x                                # Statement 4
x[1] = x[1][:5] + 'ery'              # Statement 5
y[1] = 4                             # Statement 6
w[1][:3] = 'fea'                     # Statement 7
z[4] = 42                            # Statement 8
x[0][0] = 5555                       # Statement 9
a = (x[3][1] == 1)                   # Statement 10

Answer:- 7

2. Consider the following lines of Python code.

Which of the following holds at the end of this code?

a. a[0] == 47, b[3] == 73, c[3] == 73, d[1] == 47
b. a[0] == 65, b[3] == 105, c[3] == 73, d[1] == 95
c. a[0] == 65, b[3] == 73, c[3] == 73, d[1] == 95
d. a[0] == 95, b[3] == 73, c[3] == 73, d[1] == 95

b = [43,99,65,105,4]
a = b[2:]
d = b[1:]
c = b
d[1] = 95
b[2] = 47
c[3] = 73

Answer:- c

3. What is the value of endmsg after executing the following lines?

startmsg = "anaconda"
endmsg = ""
for i in range(1,1+len(startmsg)):
  endmsg = endmsg + startmsg[-i]

Answer:- ‘anaconda’

4. What is the value of mylist after the following lines are executed?

def mystery(l):
  l = l[2:]
  return(l)

mylist = [7,11,13,17,19,21]
mystery(mylist)

Answer:- [7, 11, 13, 17, 19, 21]

Programming Data Structures And Algorithms Using Python Assignment 2 Coding Solutions July 2022

Q1. Write a function intreverse(n) that takes as input a positive integer n and returns the integer obtained by reversing the digits in n.

Write a function matched(s) that takes as input a string s and checks if the brackets “(” and “)” in s are matched: that is, every “(” has a matching “)” after it and every “)” has a matching “(” before it. Your function should ignore all other symbols that appear in s. Your function should return True if s has matched brackets and False if it does not.

Write a function sumprimes(l) that takes as input a list of integers l and retuns the sum of all the prime numbers in l.

Code:-

def intreverse(n):
  ans = 0
  while n > 0:
    (d,n) = (n%10,n//10)
    ans = 10*ans + d
  return(ans)

def matched(s):
  nested = 0
  for i in range(0,len(s)):
    if s[i] == "(":
       nested = nested+1
    elif s[i] == ")":
       nested = nested-1
       if nested < 0:
          return(False)    
  return(nested == 0)

def factors(n):
  factorlist = []
  for i in range(1,n+1):
    if n%i == 0:
      factorlist = factorlist + [i]
  return(factorlist)

def isprime(n):
  return(factors(n) == [1,n])


def sumprimes(l):
  sum = 0
  for i in range(0,len(l)):
    if isprime(l[i]):
      sum = sum+l[i]
  return(sum)

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