PCAP: Python Essentials — Final Test Answers

Python Essentials 1:

• Module 1 Test
• Module 2 Test
• Module 3 Test
• Module 4 Test
• Part 1 Summary Test

Python Essentials 2:

• Module 1 Test
• Module 2 Test
• Module 3 Test
• Module 4 Test
• Part 2 Summary Test

Python Essentials - Final Test:

• Final Test Answers

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1. What is the expected output of the following snippet?

   a = True
   b = False
   a = a or b
   b = a and b
   a = a or b
   print(a, b)

   • False False
   • True False
   • False True
   • True False

2. What is the expected output of the following snippet?

   print(len([i for i in range(0, -2)]))

   • 3
   • 1
   • 2
   • 0

3. How many stars * will the following snippet send to the console?

   i = 4
   while i > 0 :
         i -= 2
         print("*")
         if i == 2:
             break
   else:
         print("*")

   • two
   • one
   • zero
   • The snippet will enter an infinite loop, constantly printing one * per line

4. What is the sys.stdout stream normally associated with?

   • The printer
   • The keyboard
   • A null device
   • The screen

5. What is the excepted output of the following snippet?

   class X: 
        pass
   class Y(X):
        pass
   class Z(Y):
        pass
   x = X()
   z = Z()
   print(isinstance(x, z), isinstance(z, X))

   • True True
   • True False
   • False True
   • False False

6. What is the excepted output of the following snippet?

   class A:
       def __init__(self,name):
            self.name = name
   a = A("class")
   print(a)

   • class
   • name
   • A number
   • A string ending with a long hexadecimal number

7. What is the excepted result of executing the following code?

   class A:
         pass
   class B:
         pass
   class C(A, B):
         pass
   print(issubclass(C, A) and issubclass(C, B))

   • The code will print True
   • The code will raise an exception
   • The code will print an empty line
   • The code will print False

8. What is the excepted output of the following code?

   from datetime import datetime
   
   datetime = datatime(2019, 11, 27, 11, 27, 22)]
   print(datetime.strftime('%Y/%m/%d %H:%M:%S'))

   • 19/11/27 11:27:22
   • 2019/Nov/27  11:27:22
   • 2019/11/27  11:27:22       
   • 2019/November/27 11:27:22

9. What is the excepted output of the following code?

   my_string_1 = 'Bond'
   my_string_2 = 'James Bond'
   
   print(my_string_1.isalpha(), my_string_2.isalpha())

   • False True
   • True True
   • False False
   • True False

10. The meaning of a Keyword argument is determined by its:

    • both name and value assigned to it
    • position within the argument list
    • connection with existing variables
    • value only

11. Knowing that the function named m, and the code contains the following import statement:

    from f import m

    Choose the right way to invoke the function:

    • mod.f()
    • The function cannot be invoked because the import statement is invalid
    • f()
    • mod:f()

12. The Exception class contains a property named args -what is it?

    • A dictionary 
    • A list
    • A string 
    • A tuple

13. What is PEP 8?

    • A document that provides coding conventions and style guide for the C code computing the C implementation of Python
    • A document that describes the development and release schedule for Python versions
    • A document that describes an extension to Python’s import mechanism which improves sharing of Python source code files
    • A document that provides coding conventions and style guide for Python code

14. Which is the expected behavior of the following snippet?

    def fun(x):
        return 1 if x % 2 != else 2
    print(fun(fun(1)))

    • The program will output None
    • The code will cause a runtime error
    • The program will output 2
    • The program will output 1

15. Which operator would you use to check whether two values are equal?

    • ===
    • is
    • ==
    • =

16. What is the name of the directory/folder created by Python used to store pyc files?

    • __pycfiles
    • __pyc__
    • __pycache__
    • __cache__

17. What can you do if you want tell your module users that a particular variable should not be accessed directly?

    • Start its name with  __or__
    • Start its name with a capital letter
    • Use its number instead of its name
    • Build its name with lowercase letters only

18. What is the expected output of the following snippet?

    d = ('one': 1, 'three': 3, 'two':2)
    for k in sorted(d.values()):
    print(k, end=' ')

    • 1 2 3
    • 3 1 2
    • 3 2 1
    • 2 3 1

19. Select the true statements.(Select two answers)

    • The first parameter of a class method dose not have to be named self
    • The first parameter of a class method must be named self
    • If a class contains the __init__ method, it can return a value
    • If a class contains the __init__ method, it cannot return any value

20. Select the true statements. (Select two answers)

    • PyPI is short for Python Package Index
    • PyPI is the only existing Python repository
    • PyPI is one of many existing Python repository 
    • PyPI is short for Python Package Installer

21. What is the expected output of the following snippet?

    t = (1, 2, 3, 4)
    t = t[-2:-1]
    t = t[-1]
    print(t)

    • (3)
    • (3,)
    • 3
    • 33

22. What is the expected effect of running the following code?

    class A:
         def __init__(self, v):
             self._a = v + 1
    a = A(0)
    print(a._a)

    • The code will raise an AttributeError exception
    • The code will output 1
    • The code will output 2
    • The code will output 0

23. Which of the following functions provide by the os module are available in both Windows and Unix? (Select two answers)

    • chdir()
    • getgid()
    • getgroups()
    • mkdir()

24. What is the expected output of the following piece of code?

    v = 1 + 1 // 2 + 1 / 2 + 2 print(v)

    • 4.0
    • 3
    • 3.5
    • 4

25. If s is a stream opened in read mode, the following line:

    q = s.readlines()

    will assign q as :

    • dictionary 
    • tuple
    • list
    • string

26. Which of the following sentences is true about the snippet below?

    str_1 = 'string'
    str_2 = str_1[:]

    • str_1 is longer than str_2
    • str_1 and  str_2  are different (but equal) strings
    • str_1 and str_2 are different names of the same string
    • str_2 is longer than str_1

27. What is the expected result of executed the following code?

    class A:
         def __init__(self):
             pass
         def f(self):
             return 1
         def g():
             return self.f()
    a = A()
    print(a.g())

    • The code will output True
    • The code will output 0
    • The code will output 1
    • The code will raise an exception 

28. What is the expected output of the following code, located in the file module.py ?

    print(__name__)

    • main
    • modle.py
    • __main__
    • __module.py__

29. What is the excepted output of the following code?

    def a(x):
         def b():
            return x + x
         return b
    x = a('x)
    y = a('')
    print(x() + y())

    • xx
    • xxxx
    • xxxxxx
    • x

30. What is the excepted behavior of the following piece of code?

    x = 16
    while x > 0:
         print('*', end='')
         x //= 2

    • The code will output *****
    • The code will output ***
    • The code will output *
    • The code will error an infinite loop

31. A package directory/folder may contain a file intended to initialize the package. What is its name?

    • init.py
    • __init.py__
    • __init__.
    • __init__.py

32. If there is a finally: branch inside the try: block, we can say that:

    • the finally: branch will always be executed
    • the finally: branch won’t be executed if any of the except: branch is executed
    • the finally: branch won’t be executed if no exception is raised
    • the finally: branch will be executed when there is no else: branch

33. What value will be assigned to the x variable?

    z = 2
    y = 1
    x = y < z or z > y and y > z or z < y

    • True
    • False
    • 0
    • 1

34. If you want to write a byte array’s content to a stream, which method can you use?

    • writeto()
    • writefrom()
    • write()
    • writebytearray()

35. What is the expected behavior of the following snippet?

    try:
       raise Exception
    except:
       print("c")
    except BaseException:
       print("a")
    except Exception:
       print("b")

    • The code will cause an error
    • The code will output b
    • The code will output c
    • The code will output a

36. What is true about the following code snippet?

    def fun(par2, par1):
        return par2 + par1
    print(fun(par2 = 1, 2))

    • The code is erroneous
    • The code will output 3
    • The code will output 2
    • The code will output 1

37. What is the expected output of the following piece of code?

    x, y, z = 3, 2, 1
    z, y, x = x, y, z
    print(x, y, z)

    • 2 1 3
    • 1 2 2
    • 3 2 1
    • 1 2 3

38. What is the expected output of the following snippet?

    d = {}
    d['2'] = [1, 2]
    d['1'] = [3, 4]
    for x in d.keys():
        print(d[x][1], end="")

    • 24
    • 31
    • 13
    • 42

39. What is the expected output of the following snippet?

    try:
       raise Exception
    except BaseException:
       print("a", end='')
    else:
       print("b", end='')
    finnaly:
       print("c")

    • bc
    • a
    • ab
    • ac

40. If the class constructor is declare as below:

    class Class:
         def __init__(self):
             pass

    which one of the assignment is valid?

    • object = Class()
    • object = Class(1,2)
    • object = Class(None)
    • object = Class(1)

41. What is the expected output of the following code?

    from datetime import timedelta
    delta = timedelta(weeks = 1, days = 7, hours = 11)
    print(delta)

    • 7 days, 11:00:00
    • 2 weeks, 11:00:00
    • 1 week, 7 days, 11 hours
    • 14 days, 11:00:00

42. What is the expected output of the following piece of code if the user enters two lines containing 1 and 2 respectively?

    y = input()
    x = input()
    print(x + y)

    • 2
    • 21
    • 12
    • 3

43. What is the expected behavior of the following snippet?

    my_string = 'abcdef'
    def fun(s):
       del s[2]
       return s
    print(fun(my_string))

    • The program will cause an error 
    • The program will output abdef
    • The program will output acdef
    • The program will output abcef

44. What is true about the following snippet?

    def fun(d, k, v):
        d[k] = v
    my_dictionary = {}
    print(fun(my_dictionary, '1', 'v'))

    • The code is erroneous 
    • The code will output None
    • The code will output v
    • The code will output 1

45. What is the expected output of the following code?

    class A:
         A = 1
         def __init__(self):
           self.a = 0
    print(hasattr(A, 'A'))

    • False
    • 1
    • 0
    • True

46. What is the expected behavior of the following code?

    x = """
    """
    print(len(x))

    • The code will output 2
    • The code will output 3
    • The code will cause an error
    • The code will output 1

47. What is the expected output of the following code?

    import calendar
    c = calendar.Calendar(calendar.SUNDAY)
    for weekday in c.iterweekdays():
         print(weekday, end=" ")

    • 7 1 2 3 4 5 6
    • 6 0 1 2 3 4 5
    • Su Mo Tu We Th Fr Sa
    • Su

48. What is the expected output of the following code?

    def fun(n):
        s = ' '
        for i in range(n):
             s += '*'
             yield s
    for x in fun(3):
         print(x, end='')

    • ****
    • ******
    • 2***
    • *

49. What is the expected output of the following code?

    t = (1, )
    t = t[0] + t[0]
    print(t)

    • 2
    • (1, )
    • (1, 1)
    • 1

50. What is the expected result of executing the following code?

    class A:
        def a(self):
            print('a')
    class B:
        def a(self):
            print('b')
    class C(A, B):
        def c(self):
            self.a()
    o = C()
    o.c()

    • The code will print c
    • The code will print  a
    • The code will raise an exception
    • The code will print b

51. What is the expected behavior of the following code snippet?

    my_list = [1, 2, 3, 4]
    my_list = list(map(lambda x: 2*x, my_list))
    print(my_list)

    • The code will cause a runtime error
    • The code will output 1 2 3 4
    • the code will output 10
    • The code will output 2 4 6 8

52. What is the expected behavior of the following piece of code?

    d = {1: 0, 2: 1, 3: 2, 0: 1}
    x = 0
    for y in range(len(d)):
        x = d[x]
    print(x)

    • The code will output  0
    • The code will output 1
    • The code will cause a runtime error
    • The code will output 2

53. What pip operation would you use to check what Python package have been installed so far?

    • show
    • list
    • help
    • dir

54. What is true about the following line of code?

    print(len((1, )))

    • The code will output 0
    • The code is erroneous 
    • The code will output 1
    • The code will output 2

55. Which line properly invokes the function defined as below?

    def fun(a, b, c=0):
        # function body

    • fun(b=0, b=0)
    • fun(a=1, b=0, c=0)
    • fun(1, c=2)
    • fun(0)

56. What is the expected behavior of the following code?

    import os
    os.makedirs('pictures/thumbnails')
    os.rmdir('pictures')

    • The code will delete both the pictures and thumbnails directories 
    • The code will delete the pictures directory only
    • The code will raise an error
    • the code will delete the thumbnails directory only

57. What is true about the following piece of code?

    print("a", "b", "c", sep=" ' ")

    • The code is erroneous 
    • The code will output abc
    • The code will output a'b'c
    • The code will output a b c

58. What is the expected behavior of the following code?

    x = "\"
    print(len(x))

    • The code will output 3
    • The code will cause an error
    • The code will output a2
    • The code will output 1

59. What is the expected output of the following code?

    class A:
         A = 1
         def __init__(self, v=2):
             self.v = v +A.A
             A.A += 1
         def set(self, v):
             self.v +=v
             A.A += 1
             return
    a = A()
    a.set(2)
    print(a.v)

    • 7
    • 1
    • 3
    • 5

60. How many empty lines will the following snippet send to the console?

    my_list = [[c for c in range(r)] for r in range(3)]
    for element in my_list:
        if len(element) < 2:
           print()

    • two
    • three
    • zero
    • one

Python Essentials 1:

• Module 1 Test
• Module 2 Test
• Module 3 Test
• Module 4 Test
• Part 1 Summary Test

Python Essentials 2:

• Module 1 Test
• Module 2 Test
• Module 3 Test
• Module 4 Test
• Part 2 Summary Test

Python Essentials - Final Test:

• Final Test Answers