Python Institute PCEP-30-02 Online Practice Questions and Exam Preparation

Python Institute PCEP-30-02 Online Questions & Answers

• Question 111:

  What is the expected output of the following code?

  

  A. None
  B. 1
  C. The program will cause an error.
  D. 2
  B. 1

• Question 112:

  What is true about exceptions and debugging? (Select two answers.)

  A. A tool that allows you to precisely trace program execution is called a debugger.
  B. If some Python code is executed without errors, this proves that there are no errors in it.
  C. One try-except block may contain more than one except branch.
  D. The default (anonymous) except branch cannot be the last branch in the try-except block.
  A. A tool that allows you to precisely trace program execution is called a debugger.
  C. One try-except block may contain more than one except branch.

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  Explanation/Reference:

  Exceptions and debugging are two important concepts in Python programming that are related to handling and preventing errors. Exceptions are errors that occur when the code cannot be executed properly, such as syntax errors, type errors, index errors, etc. Debugging is the process of finding and fixing errors in the code, using various tools and techniques. Some of the facts about exceptions and debugging are: A tool that allows you to precisely trace program execution is called a debugger. A debugger is a program that can run another program step by step, inspect the values of variables, set breakpoints, evaluate expressions, etc. A debugger can help you find the source and cause of an error, and test possible solutions. Python has a built-in debugger module called pdb, which can be used from the command line or within the code. There are also other third-party debuggers available for Python, such as PyCharm, Visual Studio Code, etc12 If some Python code is executed without errors, this does not prove that there are no errors in it. It only means that the code did not encounter any exceptions that would stop the execution. However, the code may still have logical errors, which are errors that cause the code to produce incorrect or unexpected results. For example, if you write a function that is supposed to calculate the area of a circle, but you use the wrong formula, the code may run without errors, but it will give you the wrong answer. Logical errors are harder to detect and debug than syntax or runtime errors, because they do not generate any error messages. You have to test the code with different inputs and outputs, and compare them with the expected results34 One try-except block may contain more than one except branch. A try-except block is a way of handling exceptions in Python, by using the keywords try and except. The try block contains the code that may raise an exception, and the except block contains the code that will execute if an exception occurs. You can have multiple except blocks for different types of exceptions, or for different actions to take. For example, you can write a try-except block like this: try: # some code that may raise an exception except ValueError: # handle the ValueError exception except ZeroDivisionError: # handle the ZeroDivisionError exception except: # handle any other exception This way, you can customize the error handling for different situations, and provide more informative messages or alternative solutions5 The default (anonymous) except branch can be the last branch in the try-except block. The default except branch is the one that does not specify any exception type, and it will catch any exception that is not handled by the previous except branches. The default except branch can be the last branch in the try-except block, but it cannot be the first or the only branch. For example, you can write a try- except block like this: try: # some code that may raise an exception except ValueError: # handle the ValueError exception except: # handle any other exception This is a valid try-except block, and the default except branch will be the last branch. However, you cannot write a try-except block like this: try: # some code that may raise an exception except: # handle any exception This is an invalid try-except block, because the default except branch is the only branch, and it will catch all exceptions, even those that are not errors, such as KeyboardInterrupt or SystemExit. This is considered a bad practice, because it may hide or ignore important exceptions that should be handled differently or propagated further. Therefore, you should always specify the exception types that you want to handle, and use the default except branch only as a last resort5 Therefore, the correct answers are A. A tool that allows you to precisely trace program execution is called a debugger. and C. One try-except block may contain more than one except branch. Reference: Python Debugger ?Python pdb - GeeksforGeeksHow can I see the details of an exception in Python's debugger?Python Debugging (fixing problems)Python - start interactive debugger when exception would be otherwise thrownPython Try Except [Error Handling and Debugging -- Programming with Python for Engineers]

• Question 113:

  Consider the following code.

  

  Which statement will print True to the monitor? (Choose two.)

  A. print(languages == more_languages)
  B. print(languages is more_languages)
  C. print(more_languages is extra_languages)
  D. print(languages is extra_languages)
  A. print(languages == more_languages)
  C. print(more_languages is extra_languages)

• Question 114:

  What is the expected output of the following code?

  

  A. The code outputs nothing.
  B. 3
  C. 1
  D. 4
  C. 1

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  Explanation/Reference:

  The code snippet that you have sent is checking if two numbers are equal and printing the result. The code is as follows:

  num1 = 1 num2 = 2 if num1 == num2: print(4) else: print(1) The code starts with assigning the values 1 and 2 to the variables "num1" and "num2" respectively. Then, it enters an if statement that compares the values of "num1" and "num2"

  using the equality operator (==). If the values are equal, the code prints 4 to the screen. If the values are not equal, the code prints 1 to the screen. The expected output of the code is 1, because the values of "num1" and "num2" are not equal.

  Therefore, the correct answer is C. 1.

  Reference: [Python Institute - Entry-Level Python Programmer Certification]

• Question 115:

  Which of the following statements are true? (Choose two.)

  A. The result of the / operator is always an integer value.
  B. The ** operator uses right-sided binding.
  C. The right argument of the % operator cannot be zero.
  D. Addition precedes multiplication.
  B. The ** operator uses right-sided binding.
  C. The right argument of the % operator cannot be zero.

• Question 116:

  What is the expected output of the following code?

  

  A. 8
  B. 7.0
  C. 8.0
  D. 9.0
  C. 8.0

• Question 117:

  Evaluate the following Python arithmetic expression:

  (3 * (1 + 2) ** 2 - (2 ** 2) * 3)

  What is the result?

  A. 13
  B. 3
  C. 69
  D. 15
  D. 15

• Question 118:

  What will be the output of the following code snippet?

  

  A. 3
  B. 2
  C. 4
  D. 1
  C. 4

• Question 119:

  What is the output of the following snippet?

  

  A. 1
  C. 6
  B

• Question 120:

  What is the expected output of the following code?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  A. Option A