Programming, Data Structures And Algorithms Using Python NPTEL

Week 2 Quiz

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

x = [1,"abcd",2,"efgh",[3,4]]  # Statement 1
  y = x[0:50]                    # Statement 2
  z = y                          # Statement 3
  w = x                          # Statement 4
  x[1] = x[1] + 'd'              # Statement 5
  y[2] = 4                       # Statement 6
  x[1][1] = 'y'                  # Statement 7
  z[0] = 0                       # Statement 8
  w[4][0] = 1000                 # Statement 9
  a = (x[4][1] == 4)             # Statement 10

Ans:7

2. Consider the following lines of Python code.

x = [13,4,17,1000]
  w = x[1:]
  u = x[1:]
  y = x
  u[0] = 50
  y[1] = 40
Ans:x[1] == 40, y[1] == 40, w[0] == 4, u[0] == 50
3.What is the value of endmsg after executing the following lines?
startmsg = "hello"
  endmsg = ""
  for i in range(0,len(startmsg)):
    endmsg = startmsg[i] + endmsg
Ans:olleh
4.What is the value of mylist after the following lines are executed?
def mystery(l):
    l = l + l
    return()

  mylist = [22,34,57]
  mystery(mylist)
Ans:[22,34,57]

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