Question & Answer: Which of the following is not a legal identifier?…..

1. Which of the following is not a legal identifier?

PASS_WORD

pASSWORD

Password

2Password           [The first character must be a letter or special symbol underscore( _ )].

2. Which of the following is a legal variable name?

Global                  [The following shows the reserved words and these reserved words may not be used as constant or variable or any other identifier names. These are name, class, break.

name

class

break

3. An accessor method that returns the value of instance variable X is typically named?

setX

accessX

X

getX                     [ in Accessor methods getRed, getGreen, and getBlue these methods usually access a value].

4. Keeping the details of how an object is represented inside a class definition is called?

a)   Piracy

b)   Seclusion

c)   Encapsulation                        [Encapsulation is an Object Oriented Programming concept that binds together the data and functions that manipulate the data, and that keeps both safe from outside interference and misuse.].

d)   Hording

5. What is the missing line from the following fragment of code designed to add up the numbers in a list?

numbers = []

sum = sum(numbers[0:len(numbers)]) or sum = sum(numbers)

#missing here

      sum = sum + number

for number in range(len(nums)):

for number in range(nums):

for number in numbers::

for number in nums[i]:

6. Suppose myList = [1,2,3, 4]. Which of the following correctly deletes the value 2 from myList?

myList.remove(2)

del myList[1]

myList.pop(1)

myList.delete(1)

[The above 3 will give the correct answer 4^th syntax is array.remove(array[0])]

7 Python lists are different from arrays found in other languages because

lists can be accessed by indexing

lists grow and shrink as needed       [list2 = [1, 2, 3, 4, 5 ];]

lists items can be changed via assignment

lists can store a large collection in a single variable

8. Given the code below, suppose that ‘words’ is a list of characters (string). The following code is supposed to count the number of occurrences of each characters. What is the missing line?

counts = { }

words = ‘Here we go again’

for c in words:

counts[c] = counts[c] + 1

counts[c] = counts.get(c,0) + 1

counts[c].add(1)

counts.append(c)

9. In this code,dog, is an example of a(n):

def animal(dog):

Print (“running “, dog)

method

program

function

parameter

10. Suppose that the variable x currently has integer value 20. What statement would cause the value of x to become 15?

x = 20

x = -x + -5             =-25

x = x- + -5             =25

x = x – -5               =25

x = x + -5              =15

OOD stands for:

open object development

other object design

object oriented design

none of the above

11. What is output of the following Python code fragment?

s = “John Doe”

print(s[-3])

h

John

D        

N

12. The variables within an instance of a class:

are called global variables

are called instance variables

are called instance methods

none of the above

13. A Boolean expression

evaluates to either True or False

cannot be used in a condition

evaluates to 0 & 1

all of the above

14. Python exceptions can be caught using which one of the following?

if-else

try-except

try-catching

try-accept

15. Which of the following is not a Python data type?

int

float

Rational           

String

16. Which type of errors must be fixed before the program can be compiled?

syntax errors

logical errors    

violations

exceptions

17. Which of the following data types would you use to store the number 25.62?

str

int

num

float

18. Which of the following defines a constructor that initializes one attribute?

def __init__(name):

this.name = name

def __init__(this, name):

name = this.name

def __init__(name):

self.name = name

def __init__(self, name):

self.name = name

19. What is the value of my_num after the following statement executes?

my_num = (50 + 2 * 10 – 4) / 2

258

33       

156

29

20. Which of the following in this expression is evaluated first?

age >= 65 or age <= 18 or status == “retired”

age >= 65

status == “retired”

age <= 18

age >= 65 or age <= 18

Which of the following is true for an if statement that has both elif and else clauses?

If the condition in an elif clause is true, the statements in that clause are executed.

If the condition in the if clause is true, the statements in that clause are executed.

If the condition in the else clause is true, the statements in that clause are executed.

The statements in the else clause are always executed.

21. Which of the following is not an acceptable way to code a nested structure?

nest a for loop inside a while loop

nest an if statement inside a for loop

nest a while loop inside an elif clause

nest an else clause within an elif clause

22. Before you can use a standard module like the random module, you need to

import the module

import the module into a custom namespace

import the module into the global namespace

import the module into its default namespace

23. To work with a file when you’re using Python, you must do all but one of the following.

open the file

decode the data in the file

write data to or read data from the file

close the file