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PCAP – Programming Essentials in Python Summary Test 2 Answers

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Programming Essentials in Python Summary Test 2 Answers

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

import math

print(dir(math))

  • an error message
  • a string containing the fully qualified name of the module
  • a list of all the entities residing in the math module
  • the number of all the entities residing in the math module

2. Knowing that a function named f() resides in a module named m, and was imported using the following statement

from mod import fun

choose the right way to invoke it:

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

 

3. Assuming that all three files, a.py, b.py, and c.py reside in the same folder, what will be the output produced by 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

  • cba
  • abc
  • bac
  • cab

 

4. The compiled Python bytecode is stored in files having names ending with:

  • py
  • pyb
  • pc
  • pyc

 

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

 

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

print(__name__)

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

 

7. What will be the output of the following snippet?

try:      raise Exception

except BaseException:

print(“a”)

except Exception:

print(“b”)

except:

print(“c”)

  • c
  • b
  • it will cause an error
  • a

 

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

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

 

9. What will be the output of the following snippet?

try:

raise Exception

except:

print(“c”)

except BaseException:

print(“a”)

except Exception:

print(“b”)

  • a
  • c
  • b
  • it will cause an error

 

10. The following line of code:

for line in open(‘text.txt’,’rt’):

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

 

11. The following code prints:

x = “\\\\”

print(len(x))

  • 2
  • 1
  • 3
  • the code will cause an error

 

12. The following statement:

assert var != 0

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

 

13. The following code prints:

x = “\\\”

print(len(x))

    • 3
    • the code will cause an error-
    • 1
    • 2

 

14. The following code prints:

print(chr(ord(‘p’) + 2))

  • s
  • t
  • q
  • r

 

15. If the class’s constructor is declared as below, which one of the assignments is invalid?

class Class:

def __init__(self,val=0):

pass

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

 

16. The following code:

print(float(“1.3”))

  • raises a ValueError exception
  • prints 13
  • prints 1,3
  • 1.3

 

17. The sys.stderr stream is normally associated with:

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

 

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

class A:

pass

class B(A):

pass

class C(B):

pass

print(issubclass(A,C))

  • it will print False
  • it will print True
  • it will print 1
  • it will raise an exception

 

20. What will be output of the following code?

class A:

A = 1

def __init__(self):

self.a = 0

print(hasattr(A,’a’))

  • 1
  • False
  • 0
  • True

 

21.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()

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

 

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

class A:

def __init__(self):

pass

a = A(1)

print(hasattr(a,’A’))

  • it will print True
  • it will raise an exception
  • it will print False
  • it will print 1

 

23. What will be the effect of running the following code?

class A:

def __init__(self,v):

self.__a = v + 1

a = A(0)

print(a.__a)

  • it will print 1
  • it will print 2
  • it will raise an AttributeError exception
  • it will print 0

 

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

class I:

def __init__(self):

self.s = ‘abc’

self.i = 0

def __iter__(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=”)

  • 012
  • abc
  • cba
  • 210

 

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

def I(n):

s = ‘+’

for i in range(n):

s += s

yield s

for x in I(2):

print(x,end=”)

  • it will print ++
  • it will print ++++++
  • it will print +
  • it will print +++

 

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

try:

raise Exception(1,2,3)

except Exception as e:

print(len(e.args))

  • it will print 2
  • it will print 1
  • it will raise an unhandled exception
  • it will print 3

 

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

def o(p):

def q():

return ‘*’ * p

return q

r = o(1)

s = o(2)

print(r() + s())

 

  • it will print ****
  • it will print **
  • it will print *** 
  • it will print *

 

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

q = s.read(1)

  • read 1 character from the stream
  • read 1 kilobyte from the stream
  • read 1 line from the stream
  • read 1 buffer from the stream

 

29. Assuming that the open() invocation has gone successfully, the following snippet will:

for x in open(‘file’,’rt’):

print(x)

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

 

30. If you want to fill a byte array with data read in from a stream, you’d use:

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