PCAP: Python Essentials 2 – Part 2 Summary 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. The following code:

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

   • will print 1
   • will print 2
   • will cause an error
   • will print 3

2. What information can be read using the uname function provided by the os module? (Select two answers)

   import os
   os.mkdir('pictures')
   os.chdir('pictures')
   print(os.getcwd())

   • Last login date.
   • Current path
   • Operating system name
   • Hardware identifier

3.  The following statement:

   assert var != 0

   • ia erroneous 
   • has no effect
   • will stop the program when var == 0
   • will stop the program whrn var !=0

4. What is he except output of the following code?

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

   • 0
   • True
   • 1
   • False

5. What is the excepted result of the following code?

   from datetime import timedelta
   delta = timedelta(weeks = 1, days = 7, hours = 11)
   print(delta * 2)

   • 28 days, 22:00:00
   • 2 weeks, 14 days, 22 hours
   • 7 days, 22:00:00
   • The code will raise an exception

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

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

   • 1
   • 0
   • 2
   • 3

7. 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 except
   • The code will print 2
   • The code will print 0
   • The code will print 1

8. Knowing that a function named fun() resides in a module named mod , and was imported using the following statement:

   from mod import fun

   choose the right to invoke the fun() function:

   • mod:fun()
   • mod::fun()
   • fun()
   • mod.fun()

9. What output will appear after running the following snippet?

   import math print(dir(math))

   • The number of all the entities residing in the math module
   • A string containing the fully qualified name of the module
   • An error message
   • A list of all the entities residing in the math module

10. Look at the code below:

    import random
    #
    # Insert lines of code here.
    #
    print(a, b, 

    Which lines of code would you insert so that it is possible for the program to output the following result:

    6 82 0

    • a = random.randint(0, 100)
      b = random.randrange(10, 100, 3)
      c = random.choice((0, 100, 3))

    • a = random.choice((0, 100, 3))
      b  = random.randrange(10, 100, 3)
      c = random.randint(0, 100)

    • a  = random.randrange(10, 100, 3)
      b = random.randint(0, 100)
      c  = random.choice((0, 100, 3))

    • a  = random.randint(0, 100)
      b = random.choice((0, 100, 3))
      c  = random.randrange(10, 100, 3)

11. What is the expected result of the following code?

    from datetime import datetime
    datetime_1 = datetime(2019, 11, 27, 11, 27, 22)
    datetime_2 = datetime(2019, 11, 27, 0, 0, 0)
    print(datetime_1 - datetime_2)

    • o days
    • 0 days, 11:27:22
    • 11:27:22
    • 11 hours, 27 minutes, 22 seconds

12. What is the expected result of the following code?

    import calendar
    calendar.setfirstweekday(calendar.SUNDAY)
    print(calendar.weekheader(3))

    • Su Mo Tu We Th We Fr Sa
    • Sun Mon Tue Wed Thu Fri Sat
    • Tu
    • Tue

13. what is the expected  result of executing the following code?

    class A: 

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

14. Look at the following code:

    numbers  [0, 2, 7, 9, 10]
    # Insert line of code here.
    print(list(foo))

    Which line would you insert in order for the program to produce the expected output?

    [0, 4, 49, 81, 100]

    • foo  = lambda num: num ** 2, numbers
    • foo = lambda num: num * 2, numbers)
    • foo = filter(lambda num: num ** 2, numbers)
    • foo = map(lambda num : num ** 2, numbers)

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

    class I:
        def __init__(self):
            self.s = 'abc'
            self.i = 0
            def __init__(self):
            return self
        def __next__(self):
            if self.i == len(self.s):
               raise StopIteration
             v = self.s[self.i]
             self.i +=1
             return v
    for x in I():
        print(x, end='')

    • The code will print 210
    • The code will print abc
    • The code will print 012
    • The code will print cba

16. The complied Python bytecode is stored in files which have their names ending with:

    • py
    • pyb
    • pc
    • pyc

17. Which pip command would you use to uninstall a previously install package?

    • pip delete packagename
    • pip –uninstall packagename
    • pip –remove packagename
    • pip uninstall packagename

18. What is the excepted result of executed the following code?

    try:
        raise Exception(1, 2, 3)
    except Exception as e:
        print(len(e.args))

    • The code will raise an unhandled exception
    • The code will print 2
    •  The code will print 3
    • The code will print 1

19. What is the excepted result of executed the following snippet?

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

    • b
    • a
    • An error message
    • 1

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

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

    • The code will print Ture
    • The code will print 1
    • The code will print False
    • The code will raise an exception

21. If you want to fill a byte array with data read in from a stream, which method you can use?

    • The read() method
    • The readbytes() method
    • The readfrom() method
    • The readinto() method

22. The following code:

    print(float("1.3"))

    • will print 1.3
    • will print 13
    • will print 1,3
    • will raise a ValueError exception 

23. The following code:

    print(chr(ord('p) + 2))

    will print:

    • q
    • s
    • r
    • t

24. If there are more than one except: branches after the try: clause, we can say that:

    •  exactly one except: block will be executed
    • one or more except: blocks will be executed
    • not more than one except: block will be executed
    • none of the except: blocks will be executed

25. If the class constructor is declared in the following way:

    class Class:
         def __init__(self, vla = 0):
              pass

    which one of the assignments is invalid?

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

26. What is the expected result of the following snippet?

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

    • The code will cause a syntax error 
    • 1
    • b
    • a

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

    def my_fun(n):
        s = '+'
        for i in range(n):
            s += s
            yield s
    for x in my_fun(2):
        print(x, end='')

    • The code will print +
    • The code will print +++
    • The code will print ++
    • The code will print ++++++

28. Look at the following code:

    numbers = [i*i for i in range(5)]
    # Insert line of code here.
    print(foo)

    Which line would you insert in order for the program to produce the expected output?

    [1, 9]

    • foo = list(filter(lambda x: x % 2, numbers))
    • foo = list(filter(lambda x: x / 2, numbers))
    • foo = list(map(lambda x: x % 2, numbers))
    • foo = list(map(lambda x: x // 2, numbers))

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

    def o(p):
        def q():
            return '*' * p
        return q
    r = o(1)
    s = o(2)
    print(r() + s())

    • The code will print ***
    • The code will print ****
    • The code will print *
    • The code will print **

30. The following statement:

    from a.b import c

    causes the import of:

    • entity a from module b from package c
    • entity b from module a from package c
    • entity c from module a from package b
    • entity c from module b from package a

31. The sys.stderr stream is normally associaated with:

    • the keyboard 
    • the printer
    • a null device
    • the screen

32. What will be the output of the following code, located in the p.py file?

    print(__name__)

    • main
    • p.py
    • __main__
    • __p.py__

33. Assuming that the​ open() invocation has gone successfully, the following snippet:

    for x in open('file', 'rt')) 
        print(x)

    will:

    • read the file character by character
    • read the file line by line
    • read the whole file at once
    • cause an exception

34. If a is a stream opened in read mod, the following line:

    q = s.read(1)

    will read:

    • one line from the stream 
    • one kilobyte from the stream 
    • one buffer from the stream 
    • one character from the stream 

35. The following line of code:

    for line in open('text.txt', 'rt'):

    • in invalid because open returns nothing 
    • is invalid because open returns a non-iterable object
    • is valid because open returns an iterable object
    • may be valid if line is a list

36. What is the expected result of the following code?

    import os
    os.mkdir('pictures')
    os.chdir('pictures')
    print(os.getcwd())

    • The code will print the owner of the created directory
    • The code will print the content of the created directory
    • The code will print the name of the created directory
    • The code will print the path to the created directory

37. Assuming that the following three files a.py,b.py ,and c.py reside in the same directory, what will be the output produce after running the c.py file?

    # file a.py
    print("a", end='')
    # file b.py
    import a
    print("b", end='')
    # file c.py
    print("c", end='')
    import a
    import b

    • cab
    • cab
    • abc
    • bac

38. What is the expected result of executing the followinf code?

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

    • The code will print 1
    • The code will raise an exception
    • The code will print False
    • The code will print True

39. The following code:

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

    • will print 1
    • will print 3
    • will print 2
    • will cause an error

40. Which of the following commands would you use to check pip ‘s version? (Select two answers)

    • pip version
    • pip --version
    • pip–version
    • pip3 --version

41. What will be the result of executing the following code?

   class A:

      def a(self):

         print(‘a’)

   class B:

      def a(self):

         print(‘b’)

   class C(B,A):

      def c(self):

         self.a()

   o = C()

   o.c()

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

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