PE1 & PE2 : Python Essentials — Final Test

PE1 & PE2 : Python Essentials — Final Test

  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
    • 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
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