Python Institute PCPP-32-101 PCPP1 – Certified Professional in Python Programming 1 Exam Practice Test

The correct answer is A because { 1 } is not valid JSON syntax. In JSON, curly braces represent an object, but an object must contain name-value pairs. Property names must be strings enclosed in double quotation marks, followed by a colon and a value, such as {"id": 1}. The expression { 1 } contains a numeric value inside braces without a property name or colon, so it cannot be parsed as a JSON object. It is also not an array, because JSON arrays use square brackets, such as [1]. It is not an integer either, because the braces change the syntax. Therefore, this JSON string is erroneous.

In the given code snippet, an instance of  OwnMath  exception is raised with an explicitly specified  __cause__  attribute that refers to the original exception ( ZeroDivisionError ). This is an example of explicitly chaining exceptions in Python.

Option B is correct because it sets the font option of the button to a tuple containing the font family (‘Arial’), size (12), and style (‘italic’).

Option C is correct because it sets the font option of the button to a string containing the font family (‘Arial’), size (12), and style (‘italic’) separated by spaces.

According to PEP 8, Python's official style guide, line breaks before binary operators produce more readable code, especially in code blocks with long expressions. This is stated in several sources (1,2,6,8) and is a widely accepted convention.

The given code snippet demonstrates the concept of encapsulation in object-oriented programming. Encapsulation refers to the practice of keeping the internal state and behavior of an object hidden from the outside world and providing a public interface for interacting with the object. In the given code snippet, the  __init__  and  get_balance  methods provide a public interface for interacting with instances of the  BankAccount  class, while the  __balance  attribute is kept hidden from the outside world by using a double underscore prefix.

The correct answers are B and D. In Python’s csv module, a normal csv.reader object reads each CSV row as a list of strings, so option B is true. A csv.DictReader object reads each row into a dictionary, using field names as keys, so option D is also true. Option A is false because DictReader does not always take headers from the first row; field names can be provided explicitly through the fieldnames argument. Option C is false because DictWriter requires field names so it knows which dictionary keys correspond to CSV columns and in what order they should be written. This distinction between row lists and row dictionaries is central to CSV processing.

If the main window is too small to fit all its widgets,  some widgets may be invisible . So, the correct answer is  Option A .

When a window is not large enough to display all of its content, some widgets may be partially or completely hidden. The window will not automatically expand to fit all of its content, and no exception will be raised. The widgets will not be automatically scaled down to fit the window’s size.

If the main window is too small to fit all its widgets, some of the widgets may not be visible or may be partially visible. This is because the main window has a fixed size, and if there are more widgets than can fit within that size, some of them will be outside the visible area of the window.

To avoid this issue, you can use layout managers such as  grid ,  pack , or  place  to dynamically adjust the size and position of the widgets as the window changes size. This will ensure that all the widgets remain visible and properly arranged regardless of the size of the main window.

Option A is true because PEP 8 recommends avoiding extraneous whitespace immediately inside parentheses, brackets or braces  1 .

Option C is true because PEP 8 recommends avoiding extraneous whitespace between a trailing comma and a following close parenthesis  1 .

The json.dumps() function is used to convert a Python object into a JSON string  1 . It takes Python data as its argument, such as a dictionary or a list, and returns a JSON string.

The unbind_all() method in Tkinter is used to remove all event bindings from a widget. It is a method of the widget object and can be called on any widget in the Tkinter application. Therefore, option A is the correct answer.

Option B is incorrect because the method can be called on any widget, not just the main window widget.

Option C is correct as unbind_all() does not take any parameters.

Option D is incorrect because the method only removes event bindings and does not cause the widgets to disappear.

So, the correct answers are A and C.

The snippet raises a NameError because the variable height is referenced inside the constructor but is never defined. The __init__() method accepts only weight and sex as parameters, apart from self. When kitty = Cat(1, 'male') is executed, Python enters the constructor and evaluates self.height = height. Since there is no local variable, parameter, global variable, or built-in name called height, Python raises a NameError before the object is fully initialized. Because object construction fails, kitty.say() is never reached. The code does not print meows, and it does not raise ValueError, because the problem is not an invalid value but an undefined name.

According to PEP 8 recommendations, the two best options are  Option B  and  Option D .

Option B follows PEP 8’s suggestion that all lines should be limited to 79 characters and for longer blocks of text like docstrings or comments, the length should be limited to 72 characters 1 . Option D follows PEP 8’s conventions for writing good documentation strings (a.k.a. “docstrings”) which are immortalized in PEP 257. It suggests writing docstrings for all public modules, functions, classes, and methods 2 .

The correct answer is  C. Excalibur is the value passed to an instance variable . In the given code snippet,  self.name  is an instance variable of the  Sword  class. When an instance of the  Sword  class is created with  varl = Sword('Excalibur') , the value  'Excalibur'  is passed as an argument to the  __init__  method and assigned to the  name  instance variable of the  varl  object.

The code defines a class called  Sword  with an  __init__  method that takes one parameter  name . When a new instance of the  Sword  class is created with  varl = Sword('Excalibur') , the value of the  'Excalibur'  string is passed as an argument to the  __init__  method, and assigned to the  self.name  instance variable of the  varl  object.

The correct answers are C and D. PEP 8 recommends surrounding top-level function and class definitions with two blank lines. This improves readability by clearly separating major program units in a module. Inside a class, method definitions should be separated by a single blank line because methods are more closely related and need less visual separation than top-level definitions. Option A is incorrect because imports are commonly grouped into standard library imports, third-party imports, and local application imports, with blank lines separating those groups. Option B is incorrect because one blank line is insufficient for top-level functions and classes under PEP 8. These spacing rules support clean, predictable, maintainable Python code layout.

The correct answer is D because var1 is a class variable defined directly inside the Sword class body. Class variables belong to the class object itself and can be accessed or updated by qualifying them with the class name, such as Sword.var1 = 'blade'. The snippet does not raise an AttributeError or ValueError; creating s1 = Sword() correctly calls __init__() and assigns the instance attribute self.name. Option C is not correct in this context because cls is only automatically available inside a class method when declared as the first parameter. Outside such a method, cls is just an undefined name unless explicitly assigned.

ElementTree is a Python built-in module that provides a simple and efficient API for parsing and creating XML data. It allows you to access and manipulate XML data in a very straightforward way, making it easy to write XML processing applications.

The correct answers are  A. An attribute owned by every exception object  and  D. An attribute that holds interesting information that is particularly useful when the programmer wants to store exception details in other objects . A traceback is an attribute of an exception object that contains a stack trace representing the call stack at the point where the exception was raised. The traceback attribute holds information about the sequence of function calls that led to the exception, which can be useful for debugging and error reporting.

The two true statements related to PEP 8 programming recommendations for code writing are  Option B  and  Option D .

Option B is true because PEP 8 recommends making object type comparisons using the  isinstance()  method instead of comparing types directly  1 .

Option D is true because PEP 8 recommends not writing string literals that rely on significant trailing whitespaces as they may be visually indistinguishable, and certain editors may trim them  1 .

A. It addresses a service deployed at localhost (the host where the code is run).

This statement is true because localhost is a special hostname that refers to the local machine or the current host where the code is run. It is equivalent to using the IP address 127.0.0.1, which is the loopback address of the network interface. By using localhost as the hostname, the invocation addresses a service that is deployed on the same machine as the client.

D. It addresses a service listening at port 3000.

This statement is true because port 3000 is the part of the URL that follows the colon after the hostname. It specifies the port number where the service is listening for incoming requests. A port number is a 16-bit integer that identifies a specific process or application on a host. By using port 3000, the invocation addresses a service that is listening at that port.

B. It addresses a service whose timeout is set to 3000 ms.

This statement is false because timeout is not a part of the URL, but a parameter that can be passed to the requests.get () function in Python. Timeout specifies how long to wait for the server to send data before giving up. It is measured in seconds, not milliseconds. By using timeout=3, the invocation sets the timeout to 3 seconds, not 3000 ms.

C. It addresses a service located at the following address local.host.com.

This statement is false because local.host.com is not the same as localhost. Local.host.com is a fully qualified domain name (FQDN) that consists of three parts: local, host, and com. It requires DNS resolution to map it to an IP address. Localhost, on the other hand, is a special hostname that does not require DNS resolution and always maps to 127.0.0.1. By using localhost as the hostname, the invocation does not address a service located at local.host.com.

The correct answers are B and D. In Tkinter’s Canvas widget, there is no built-in method named create_shape() or create_triangle_shape(). A triangle can be drawn either with create_line() by connecting three line segments between three coordinate points, or with create_polygon() by providing three vertices. create_polygon() is the more direct method because a triangle is a polygon with three sides, and Tkinter can render it as a filled or outlined shape. create_line() is also valid when the programmer manually draws the three sides and closes the shape. Therefore, the valid Canvas methods for producing a triangle are create_line() and create_polygon().