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

Python Institute PCEP-30-02 Online Questions & Answers

• Question 301:

  The ABC company needs a way to nd the count of particular letters in their publications to ensure that there is a good balance. It seems that there have been complaints about overuse of the letter e. You need to create a function to meet the requirements.

  

  What would you insert instead of ??? and ??? ?

  A. 1 | word in word_list 2 | word in letter
  B. 1 | word_list in word 2 | letter in word
  C. 1 | word in word_list 2 | letter in word
  D. 1 | word is word_list 2 | letter in word
  E. 1 | word_list in word 2 | word in letter
  F. 1 | word in word_list 2 | letter is word
  C. 1 | word in word_list 2 | letter in word

• Question 302:

  What is the best de nition of a script?

  A. It's a text le that contains sequences of zeroes and ones
  B. It's a text le that contains instructions which make up a Python program
  C. It's an error message generated by the interpreter
  D. It's an error message generated by the compiler
  B. It's a text le that contains instructions which make up a Python program

• Question 303:

  What is the expected output of the following code? x = 2 y = 6 x += 2 ** 3 x //= y // 2 // 3 print(x)

  B. 10
  D. 11
  B. 10

• Question 304:

  What is the expected output of the following code?

  

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

• Question 305:

  Take a look at the snippet and choose one of the following statements which is true:

  

  A. vals is longer than nums
  B. nums and vals are of the same length
  C. nums is longer than vals
  B. nums and vals are of the same length

• Question 306:

  What is the expected behavior of the following program?

  

  A. The program will output Hello! to the screen
  B. The program will generate an error on the screen
  C. The program will output ("Hello!") to the screen
  D. The program will output "Hello!" to the screen
  A. The program will output Hello! to the screen

• Question 307:

  Consider the following code.

  

  What does the second assignment do?

  A. It shortens the list.
  B. It reverses the list.
  C. It doesn't change the list.
  D. It extends the list.
  B. It reverses the list.

• Question 308:

  What do you call a tool that lets you launch your code step-by-step and inspect it at each moment of execution?

  A. An editor
  B. A debugger
  C. A console
  B. A debugger

• Question 309:

  What is the expected behavior of the following program if the user enters 0?

  

  A. The program will raise the ZeroDivisionError exception
  B. The program will raise the ValueError exception
  C. The program will raise the TypeError exception
  D. The program will output 0 to the console
  C. The program will raise the TypeError exception

• Question 310:

  What is the expected result of the following code?

  

  A. The code is erroneous and cannot be run.
  B. 20
  C. 10
  D. 30
  A. The code is erroneous and cannot be run.

  ---

  Explanation/Reference:

  The code snippet that you have sent is trying to use the global keyword to access and modify a global variable inside a function. The code is as follows:

  speed = 10 def velocity(): global speed speed = speed + 10 return speed print(velocity())

  The code starts with creating a global variable called "speed" and assigning it the value 10. A global variable is a variable that is defined outside any function and can be accessed by any part of the code. Then, the code defines a function

  called "velocity" that takes no parameters and returns the value of "speed" after adding 10 to it. Inside the function, the code uses the global keyword to declare that it wants to use the global variable "speed", not a local one. A local variable is

  a variable that is defined inside a function and can only be accessed by that function. The global keyword allows the function to modify the global variable, not just read it. Then, the code adds 10 to the value of "speed" and returns it. Finally,

  the code calls the function "velocity" and prints the result. However, the code has a problem. The problem is that the code uses the global keyword inside the function, but not outside. The global keyword is only needed when you want to

  modify a global variable inside a function, not when you want to create or access it outside a function. If you use the global keyword outside a function, you will get a SyntaxError exception, which is an error that occurs when the code does not

  follow the rules of the Python language. The code does not handle the exception, and therefore it will terminate with an error message.

  The expected result of the code is an unhandled exception, because the code uses the global keyword incorrectly. Therefore, the correct answer is A. The code is erroneous and cannot be run.

  Reference: Python Global Keyword - W3SchoolsPython Exceptions: An Introduction ?Real Python

  The code is erroneous because it is trying to call the "velocity" function without passing any parameter, which will raise a TypeError exception. The "velocity" function requires one parameter "x", which is used to calculate the return value of

  "speed" multiplied by "x". If no parameter is passed, the function will not know what value to use for "x".

  The code is also erroneous because it is trying to use the "new_speed" variable before it is defined. The "new_speed" variable is assigned the value of 20 after the first function call, but it is used as a parameter for the second function call,

  which will raise a NameError exception. The variable should be defined before it is used in any expression or function call.

  Therefore, the code will not run and will not produce any output.

  The correct way to write the code would be:

  # Define the speed variable

  speed = 10

  # Define the velocity function

  def velocity(x):

  return speed * x

  # Define the new_speed variable

  new_speed = 20

  # Call the velocity function with new_speed as a parameter

  print(velocity(new_speed))

  Copy

  This code will print 200, which is the result of 10 multiplied by 20.

  References:

  [Python Programmer Certification (PCPP) ?Level 1]

  [Python Programmer Certification (PCPP) ?Level 2]

  [Python Programmer Certification (PCPP) ?Level 3]

  [Python: Built-in Exceptions]

  [Python: Defining Functions]

  [Python: More on Variables and Printing]