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

Python Institute PCEP-30-02 Online Questions & Answers

• Question 41:

  What is the expected output of the following code? print(chr(ord('z') - 2))

  B. y
  C. a
  D. z
  A

• Question 42:

  What is the output of the following code?

  

  A. 1 | Very very bad input...
  B. 1 | Bad input...
  C. 1 | Very bad input...
  D. 1 | Booo!
  A. 1 | Very very bad input...

• Question 43:

  Which of the following statements can be used to return the length of the given string str?

  A. str.size()
  B. str._len_()
  C. size(str)
  D. len(str)
  D. len(str)

• Question 44:

  Which of the following lines properly starts a function using two parameters, both with zeroed default values?

  A. def fun(a=0, b=0):
  B. def fun(a=b=0):
  C. fun fun(a=0, b):
  D. fun fun(a, b=0):
  A. def fun(a=0, b=0):

• Question 45:

  What is the expected output of the following code?

  

  A. 1 3
  B. 3 3
  C. The code is erroneous.
  D. 1 1
  E. 3 1
  B. 3 3

• Question 46:

  What is the expected output of the following code?

  

  A. 2
  C. 3
  D. 1
  D. 1

  ---

  Explanation/Reference:

  The code snippet that you have sent is using the count method to count the number of occurrences of a value in a list. The code is as follows:

  my_list = [1, 2, 3, 4, 5] print(my_list.count(1))

  The code starts with creating a list called "my_list" that contains the numbers 1, 2, 3, 4, and

  5. Then, it uses the print function to display the result of calling the count method on the list with the argument 1. The count method is used to return the number of times a value appears in a list. For example, my_list.count(1) returns 1,

  because 1 appears once in the list.

  The expected output of the code is 1, because the code prints the number of occurrences of 1 in the list. Therefore, the correct answer is D. 1.

  Reference: Python List count() Method - W3Schools

• Question 47:

  What is the expected output of the following code?

  

  A. 3
  B. 5
  C. The code is erroneous.
  D. 14
  D. 14

• Question 48:

  What is the expected output of the following code?

  

  B. The code is erroneous.
  C. 2
  D. 1
  D. 1

• Question 49:

  What is true about tuples? (Select two answers.)

  A. Tuples are immutable, which means that their contents cannot be changed during their lifetime.
  B. The len { } function cannot be applied to tuples.
  C. An empty tuple is written as { } .
  D. Tuples can be indexed and sliced like lists.
  A. Tuples are immutable, which means that their contents cannot be changed during their lifetime.
  D. Tuples can be indexed and sliced like lists.

  ---

  Explanation/Reference:

  Tuples are one of the built-in data types in Python that are used to store collections of data. Tuples have some characteristics that distinguish them from other data types, such as lists, sets, and dictionaries. Some of these characteristics are:

  Tuples are immutable, which means that their contents cannot be changed during their lifetime. Once a tuple is created, it cannot be modified, added, or removed. This makes tuples more stable and reliable than mutable data types. However,

  this also means that tuples are less flexible and dynamic than mutable data types. For example, if you want to change an element in a tuple, you have to create a new tuple with the modified element and assign it to the same variable12

  Tuples are ordered, which means that the items in a tuple have a defined order and can be accessed by using their index. The index of a tuple starts from 0 for the first item and goes up to the length of the tuple minus one for the last item.

  The index can also be negative, in which case it counts from the end of the tuple. For example, if you have a tuple t = ("a", "b", "c"), then t[0] returns "a", and t[- 1] returns "c"12

  Tuples can be indexed and sliced like lists, which means that you can get a single item or a sublist of a tuple by using square brackets and specifying the start and end index. For example, if you have a tuple t = ("a", "b", "c", "d", "e"), then t[2]

  returns "c", and t[1:4] returns ("b", "c", "d"). Slicing does not raise any exception, even if the start or end index is out of range. It will just return an empty tuple or the closest possible sublist12

  Tuples can contain any data type, such as strings, numbers, booleans, lists, sets, dictionaries, or even other tuples. Tuples can also have duplicate values, which means that the same item can appear more than once in a tuple. For example,

  you can have a tuple t = (1, 2, 3, 1, 2), which contains two 1s and two 2s12 Tuples are written with round brackets, which means that you have to enclose the items in a tuple with parentheses. For example, you can create a tuple t = ("a", "b",

  "c") by using round brackets. However, you can also create a tuple without using round brackets, by just separating the items with commas. For example, you can create the same tuple t = "a", "b", "c" by using commas. This is called tuple

  packing, and it allows you to assign multiple values to a single variable12 The len() function can be applied to tuples, which means that you can get the number of items in a tuple by using the len() function. For example, if you have a tuple t =

  ("a", "b", "c"), then len(t) returns 312

  An empty tuple is written as (), which means that you have to use an empty pair of parentheses to create a tuple with no items. For example, you can create an empty tuple t = () by using empty parentheses. However, if you want to create a

  tuple with only one item, you have to add a comma after the item, otherwise Python will not recognize it as a tuple. For example, you can create a tuple with one item t = ("a",) by using a comma12

  Therefore, the correct answers are A. Tuples are immutable, which means that their contents cannot be changed during their lifetime. and D. Tuples can be indexed and sliced like lists.

  Reference: Python Tuples - W3SchoolsTuples in Python - GeeksforGeeks

• Question 50:

  What is the expected behavior of the following program?

  

  A. The program will cause a AttributeError exception.
  B. The program will cause a SyntaxError exception.
  C. The program will output 1 to the screen.
  D. The program will cause a ValueError exception.
  E. The program will cause a TypeError exception.
  D. The program will cause a ValueError exception.