Download PrepIQ Pyhton Programming Certifications CAPP CPPP Ultimate Exam and more Exams Technology in PDF only on Docsity!
Certifications CAPP CPPP Ultimate
Exam
Question 1. Which special method is called automatically when a new instance of a class is created? A) del B) new C) init D) repr Answer: C Explanation: init is the constructor that initializes a newly created object after new has allocated it. **Question 2. What is the output of the following code?
class A: x = 5 a = A() print(a.x) ```** A) 5 B) None C) AttributeError D) 0 Answer: A Explanation: x is a class variable; instances can access it via attribute lookup. **Question 3. Which decorator turns a regular method into a class method?** ## Certifications CAPP CPPP Ultimate ## Exam A) @staticmethod B) @property C) @classmethod D) @abstractmethod Answer: C Explanation: @classmethod receives the class (cls) as its first argument instead of the instance. **Question 4. In Python, what does the __dict__ attribute of an object contain?** A) List of all methods B) Dictionary of the object’s writable attributes C) Tuple of base classes D) Source code of the class Answer: B Explanation: __dict__ stores a mapping of attribute names to their current values for that object. **Question 5. Which of the following statements about multiple inheritance is true?** A) Python resolves method calls using depth-first search only. B) The super() function cannot be used with multiple inheritance. C) The Method Resolution Order (MRO) can be inspected via the __mro__ attribute. D) All parent classes must be listed in alphabetical order. Answer: C ## Certifications CAPP CPPP Ultimate ## Exam D) pickle.write(obj, 'file.pkl') Answer: B Explanation: pickle works with binary streams; the file must be opened in 'wb' mode. **Question 9. What is a metaclass in Python?** A) A class that creates instances of other classes B) A function that decorates methods C) A built-in type used for type checking only D) A module that provides logging capabilities Answer: A Explanation: Metaclasses are classes of classes; they control class creation. **Question 10. Which descriptor method is called when an attribute is accessed on an instance?** A) __set__ B) __delete__ C) __get__ D) __init__ Answer: C Explanation: The __get__(self, instance, owner) method defines attribute read behavior. **Question 11. The sys.path list is used for which purpose?** A) Storing command-line arguments B) Defining the Python import search path ## Certifications CAPP CPPP Ultimate ## Exam C) Managing environment variables D) Registering installed packages Answer: B Explanation: sys.path contains directories that Python searches for modules to import. **Question 12. Which import statement imports only the sqrt function from the math module?** A) import math.sqrt B) from math import sqrt C) import sqrt from math D) import math as sqrt Answer: B Explanation: from module import name imports a specific attribute into the current namespace. **Question 13. What is the purpose of the __init__.py file in a package directory?** A) To declare the package’s version number B) To indicate that the directory should be treated as a Python package C) To list all sub-modules in the package D) To execute the package’s main function automatically Answer: B Explanation: Presence of __init__.py tells Python that the directory is a package (pre-PEP 420). ## Certifications CAPP CPPP Ultimate ## Exam Explanation: 5! = 5×4×3×2×1 = 120. **Question 17. Which function from the random module returns a random floating-point number in the range [0.0, 1.0)?** A) randint() B) random() C) uniform() D) randrange() Answer: B Explanation: random.random() returns a float in the half-open interval [0.0, 1.0). **Question 18. How can you retrieve the value of an environment variable named "HOME"?** A) os.getenv('HOME') B) sys.env['HOME'] C) os.environ('HOME') D) sys.getenv('HOME') Answer: A Explanation: os.getenv returns the value of an environment variable or None if it does not exist. **Question 19. Which exception is raised when an invalid literal is passed to int()?** A) TypeError B) ValueError C) SyntaxError ## Certifications CAPP CPPP Ultimate ## Exam D) AttributeError Answer: B Explanation: int('abc') raises ValueError because the string cannot be converted to an integer. **Question 20. In a try-except-else-finally block, when is the else clause executed?** A) Only if an exception occurs B) Only if no exception occurs in the try block C) Always, regardless of exceptions D) Only if the finally block raises an exception Answer: B Explanation: The else block runs when the try block completes without raising an exception. **Question 21. Which statement correctly raises a custom exception named MyError?** A) raise MyError() B) throw MyError() C) raise MyError D) MyError.raise() Answer: A Explanation: raise expects an exception instance (or class); MyError() creates the instance. **Question 22. What is the base class for most built-in exceptions in Python? ** ## Certifications CAPP CPPP Ultimate ## Exam **Question 25. Which logging level will capture all messages including debug information?** A) INFO B) WARNING C) DEBUG D) ERROR Answer: C Explanation: DEBUG is the lowest built-in level; configuring the logger to DEBUG captures all higher-level messages as well. **Question 26. How do you add a file handler to a logger named "app"?** A) logging.FileHandler('app.log') B) logger.addHandler(logging.FileHandler('app.log')) C) logging.addHandler('app.log') D) logger.setFile('app.log') Answer: B Explanation: You create a FileHandler and attach it to the logger via addHandler. **Question 27. Which function from the pdb module starts an interactive debugging session at the current line?** A) pdb.set_trace() B) pdb.debug() C) pdb.run() D) pdb.start() ## Certifications CAPP CPPP Ultimate ## Exam Answer: A Explanation: pdb.set_trace() drops you into the debugger at that point. **Question 28. What is the output of the following code? ```python s = "Python" print(s[0:3]) ```** A) Py B) Pyt C) Pyth D) Python Answer: B Explanation: Slice 0:3 returns characters at indices 0,1,2 → "Pyt". **Question 29. Which method returns a list of Unicode code points for each character in a string?** A) ord() B) chr() C) encode() D) decode() Answer: A Explanation: ord('A') returns the integer code point of a single character; applying it to each character yields the list. **Question 30. What does the re.search(r'\d+', 'abc42def') return?** ## Certifications CAPP CPPP Ultimate ## Exam **Question 33. Which comprehension creates a set of squares of numbers from 0 to 4?** A) {x**2 for x in range(5)} B) [x**2 for x in range(5)] C) (x**2 for x in range(5)) D) {x**2 for x in range(0,5,1)} Answer: A Explanation: Set comprehensions use curly braces; the expression generates {0,1,4,9,16}. **Question 34. What is a closure in Python?** A) A function that calls itself recursively B) A nested function that captures variables from its enclosing scope C) A class that encapsulates data and methods D) A decorator that modifies another function’s behavior Answer: B Explanation: A closure retains references to variables from the outer (enclosing) function even after that function has finished executing. **Question 35. Which lambda expression correctly doubles its input x?** A) lambda x: x * 2 B) lambda x: 2 + x C) lambda: x * 2 D) lambda x, y: x * y Answer: A Explanation: The lambda takes one argument x and returns x multiplied by 2. ## Certifications CAPP CPPP Ultimate ## Exam **Question 36. What does the following code print? ```python list(map(lambda n: n*3, [1,2,3])) ```** A) [1,2,3] B) [3,6,9] C) (3,6,9) D) {3,6,9} Answer: B Explanation: map applies the lambda to each element, producing a list of tripled numbers. **Question 37. Which mode opens a file for reading binary data?** A) 'r' B) 'rb' C) 'b' D) 'br' Answer: B Explanation: The 'b' flag indicates binary mode; combined with 'r' it opens for reading binary. **Question 38. What is the effect of using the with statement when opening a file?** A) It automatically creates the file if it does not exist. B) It locks the file for exclusive access. ## Certifications CAPP CPPP Ultimate ## Exam A) It lists the methods defined in the class. B) It shows the order in which base classes are searched for attributes. C) It is only available for new-style classes in Python 2. D) It can be modified at runtime to change inheritance. Answer: B Explanation: __mro__ (Method Resolution Order) is a tuple defining the linearization of base classes. **Question 42. What does the following code output? ```python class B: def __init__(self): self.__value = 10 def get(self): return self.__value b = B() print(b.get()) ```** A) 10 B) AttributeError C) NameError D) 0 Answer: A Explanation: Name mangling changes __value to _B__value, but the method accesses the mangled name correctly. ## Certifications CAPP CPPP Ultimate ## Exam **Question 43. Which statement correctly creates a static method called greet inside class Greeter?** A) @staticmethod def greet(): ... B) def greet(self): @staticmethod ... C) staticmethod def greet(): ... D) @classmethod def greet(): ... Answer: A Explanation: @staticmethod decorates a function that receives no implicit first argument. **Question 44. What will be printed? ```python def outer(): x = 5 def inner(): nonlocal x x = 10 inner() print(x) outer() ```** A) 5 B) 10 C) UnboundLocalError ## Certifications CAPP CPPP Ultimate ## Exam B) os.path.cwd() C) os.current_dir() D) os.getcwd() Answer: A Explanation: os.getcwd() returns the absolute path of the current working directory. **Question 48. What does sys.argv contain?** A) A dictionary of environment variables B) A list of command-line arguments passed to the script C) The version of the Python interpreter D) The list of imported modules Answer: B Explanation: sys.argv[0] is the script name; subsequent items are arguments. **Question 49. Which built-in function can be used to convert an integer to its binary string representation?** A) bin() B) hex() C) oct() D) str() Answer: A Explanation: bin(10) returns '0b1010'. **Question 50. What is the result of the expression `'Hello' * 3`?** ## Certifications CAPP CPPP Ultimate ## Exam A) 'HelloHelloHello' B) ['Hello', 'Hello', 'Hello'] C) ('Hello', 'Hello', 'Hello') D) TypeError Answer: A Explanation: Multiplying a string by an integer repeats it that many times. **Question 51. Which of the following statements creates a dictionary comprehension that maps numbers 0-3 to their squares?** A) {i: i*i for i in range(4)} B) [i: i*i for i in range(4)] C) (i: i*i for i in range(4)) D) {i*i for i in range(4)} Answer: A Explanation: Dictionary comprehensions use curly braces with key: value pairs. **Question 52. Which of these is the correct way to catch both ValueError and TypeError in a single except clause?** A) except (ValueError, TypeError): B) except ValueError or TypeError: C) except ValueError, TypeError: D) except [ValueError, TypeError]: Answer: A Explanation: A tuple of exception classes can be supplied to a single except clause.
