Python Institute PCPP1 Practice Test : Free Online Preparation

Question 1
- You are developing a Python project and want to follow the PEP 8 guidelines for using comments effectively. Which of the following scenarios demonstrates the correct usage of block comments and inline comments according to PEP 8?
  
  A : def calculate_sum(a, b):
  # This function calculates the sum of two numbers
  return a + b
  
  B : # This function calculates the sum of two numbers
  def calculate_sum(a, b):
  """
  Adding the numbers together.
  """
  return a + b
  
  C : # This function calculates the sum of two numbers
  def calculate_sum(a, b):
  return a + b # Adding the numbers together
  
  D : # calculate_sum function
  # This function adds two numbers together and returns the result
  def calculate_sum(a, b):
  return a + b
  
  E : def calculate_sum(a, b):
  """
  This function calculates the sum of two numbers.
  Args:
  a: The first number.
  b: The second number.
  Returns:
  The sum of the two numbers.
  """
  return a + b
  
  Answer: E
Question 2
- Which of the following copy operations will have the worst performance?
  A :
  The answer cannot be unequivocally determined.
  
  B :
  Simple reference copy:
  numbers = [[i - 1, i, i + 1] for i in range(1_000_000)]
  copy = numbers
  
  C :
  Shallow copy:
  numbers = [[i - 1, i, i + 1] for i in range(1_000_000)]
  copy = numbers[:]
  
  D :
  Deep copy:
  import copy
  
  numbers = [[i - 1, i, i + 1] for i in range(1_000_000)]
  copy = copy.deepcopy(numbers)
  
  Answer: D
Question 3
- Consider the following Python function:
  def process_data(*args, **kwargs):
  if "mode" in kwargs:
  mode = kwargs['mode']
  if mode == 'sum':
  result = sum(args)
  elif mode == 'product':
  result = 1
  for arg in args:
  result *= arg
  else:
  result = None
  else:
  result = None
  return result
  Which of the following function calls will correctly compute the product of the given numbers?
  
  A : process_data(mode='product', args=[2, 4, 6])
  
  B : process_data(2, 4, 6, 'product')
  
  C : process_data(mode='product', 2, 4, 6)
  
  D : process_data(2, 4, 6, mode='product')
  
  Answer: D
Question 4
- Select all the true statements about the self named argument. (select 2)
  
  A : It's used as a reference to the class instance.
  
  B : It's a reserved keyword in Python.
  
  C : This is nothing more than a convention: the name self has absolutely no special meaning to Python
  
  D : It can be used before an instance is created when to access a class variable.
  
  Answer: A,C
Question 5
- In the context of the SQLite database, which of the following commands is correct for updating a record in a table named Students, given that we want to change the Grade of the student with ID 123 to 'A'?
  
  A : UPDATE Students WHERE ID = 123 SET Grade = 'A';
  
  B : MODIFY Students SET Grade = 'A' WHERE ID = 123;
  
  C : UPDATE Students SET Grade = 'A' AND ID = 123;
  
  D : UPDATE Students SET Grade = 'A' WHERE ID = 123;
  
  Answer: D

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