PCAP : Certified Associate in Python Programming : Part 02

PCAP : Certified Associate in Python Programming : Part 02

1. Can a module run like regular code?

   • yes, and it can differentiate its behavior between the regular launch and import
   • it depends on the Python version
   • yes, but in cannot differentiate its behavior between the regular launch and import
   • no, it is not possible; a module can be imported, not run

2. Select the valid fun () invocations:
   (Choose two.)

   

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

3. A file name like this one below says that:
   (Choose three.)

   services, cpython 36.pyc

   • the interpreter used to generate the file is version 3.6
   • it has been produced by CPython
   • it is the 36th version of the file
   • the file comes from the services.py source file

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

   

   It will:

   • cause a runtime exception
   • print 1
   • print 0, [1]
   • print [1]

   Explanation:

   

5. What can you do if you don’t like a long package path like this one?

   

   • you can make an alias for the name using the alias keyword
   • nothing, you need to come to terms with it
   • you can shorten it to alpha . zeta and Python will find the proper connection
   • you can make an alias for the name using the as keyword
   Explanation:
   Reference: https://stackoverflow.com/questions/706595/can-you-define-aliases-for-imported-modules-in-python

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

   

   • abcef
   • The program will cause a runtime exception/error
   • acdef
   • abdef
   Explanation:
   

   

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

   

   • 21
   • 2
   • 3
   • 12
   Explanation:
   

   

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

   

   It will:

   • cause a runtime exception on line 02
   • cause a runtime exception on line 01
   • cause a runtime exception on line 03
   • print 3
   Explanation:
   

   

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

   

   It will:

   • print 4321
   • print <generator object f at (some hex digits)>
   • cause a runtime exception
   • print 1234
   Explanation:
   

   

10. If you need a function that does nothing, what would you use instead of XXX? (Choose two.)

    

    • pass
    • return
    • exit
    • None
    Explanation:
    Reference: https://www.pythoncentral.io/python-null-equivalent-none/

11. Is it possible to safely check if a class/object has a certain attribute?

    • yes, by using the hasattr attribute
    • yes, by using the hasattr ( ) method
    • yes, by using the hassattr ( ) function
    • no, it is not possible
    Explanation:
    Reference: https://stackoverflow.com/questions/610883/how-to-know-if-an-object-has-an-attribute-in-python

12. The first parameter of each method:

    • holds a reference to the currently processed object
    • is always set to None
    • is set to a unique random value
    • is set by the first argument’s value
    Explanation:
    Reference: https://pythontips.com/2013/08/07/the-self-variable-in-python-explained/

13. The simplest possible class definition in Python can be expressed as:

    • class X:
    • class X:
      pass
    • class X:
      return
    • class X: { }
    Explanation:
    Reference: https://docs.python.org/3/tutorial/classes.html

14. If you want to access an exception object’s components and store them in an object called e, you have to use the following form of exception statement:

    • except Exception (e) :
    • except e= Exception :
    • except Exception as e:
    • such an action is not possible in Python
    Explanation:
    Reference: https://stackoverflow.com/questions/32613375/python-2-7-exception-handling-syntax

15. A variable stored separately in every object is called:

    • there are no such variables, all variables are shared among objects
    • a class variable
    • an object variable
    • an instance variable

16. There is a stream named s open for writing. What option will you select to write a line to the stream?

    • s. write (“Hello\n”)
    • write (s, “Hello”)
    • s.writeln (“Hello”)
    • s. writeline (“Hello”)
    Explanation:
    Reference: https://en.wikibooks.org/wiki/Python_Programming/Input_and_Output

17. You are going to read just one character from a stream called s. Which statement would you use?

    • ch = read (s, 1)
    • ch= s.input (1)
    • ch= input (s, 1)
    • ch= s.read (1)
    Explanation:
    Reference: https://stackoverflow.com/questions/510357/python-read-a-single-character-from-the-user

18. What can you deduce from the following statement? (Choose two.)

    

    • str is a string read in from the file named file.txt
    • a newline character translation will be performed during the reads
    • if file. txt does not exist, it will be created
    • the opened file cannot be written with the use of the str variable

19. The following class hierarchy is given. What is the expected out of the code?

    

    • BB
    • CC
    • AA
    • BC

20. Python’s built in function named open () tries to open a file and returns:

    • an integer value identifying an opened file
    • an error code (0 means success)
    • a stream object
    • always None