Python Institute PCPP-32-101 Dumps

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 .

The socket.gaierror exception is raised when an address-related error caused by the getaddrinfo() and getnameinfo() functions occurs. These functions are used to translate hostnames to IP addresses and vice versa, and the gaierror exception is raised if they fail to perform this translation.

C. The execute method is provided by the Cursor class

This statement is true because the execute method is one of the methods of the Cursor class in the sqlite3 module. The Cursor class represents an object that can execute SQL statements and fetch results from a database connection. The execute method takes an SQL query as an argument and executes it against the database. For example, cur = conn.cursor (); cur.execute (“SELECT * FROM table”) creates and executes a cursor object that selects all rows from a table.

D. The fetchone method returns None when no rows are available

This statement is true because the fetchone method is another method of the Cursor class in the sqlite3 module. The fetchone method fetches the next row of a query result set and returns it as a single tuple or None if no more rows are available. For example, row = cur.fetchone () fetches and returns one row from the cursor object or None if there are no more rows.

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 correct answers are C and D. Custom application exceptions should normally inherit from Exception, not directly from BaseException. BaseException is intended for system-exiting exceptions such as SystemExit, KeyboardInterrupt, and GeneratorExit, so deriving ordinary errors from it can interfere with normal control flow. PEP 8 also discourages broad or bare except: clauses because they catch too much and can hide programming errors or prevent expected interruption behavior. Specific exception handling is clearer, safer, and easier to debug. Option A reverses the intended guidance: exception hierarchies should help code distinguish what went wrong programmatically. Option B is false because a bare except: can catch system-level exceptions, which is exactly why it should be avoided.

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 C. In Python, exception objects have a __traceback__ attribute that stores traceback information connected with the point where the exception was raised. This makes option C true. The traceback object can be processed using functions from the traceback module, including traceback.format_tb(), which formats traceback entries into readable strings, so option B is also true. Option A is wrong because __traceback__ is not a special method and is not “delivered” by the traceback module; it is an exception attribute. Option D is also incorrect because the attribute is not limited only to exceptions in an explicit or implicit exception chain.

If you do not define the quoting argument in the writer method provided by the csv module, the default quoting behavior is set to QUOTE_MINIMAL. This means that fields containing special characters such as the delimiter or newline character will be quoted, while fields that do not contain special characters will not be quoted.

The correct answer is D. In Tkinter, the text displayed on a Button widget is normally configured with the keyword argument text. For example, Button(root, text="OK") creates a button whose visible caption is OK. This value is not determined by the second or third positional argument in a reliable, recommended way. Tkinter widget constructors are designed to receive the parent widget first and then configuration options as keyword arguments. The keyword title is not the standard option for button captions; titles are associated more with windows, such as setting a top-level window title. For a button’s label, the correct constructor argument is text.

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.

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.

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 .

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  @property  decorator should be defined after the method that is responsible for setting an encapsulated attribute is a false sentence. In fact, the  @property  decorator should be defined before the method that is used to set the attribute value. The  @property  decorator and the setter and deleter methods work together to create an encapsulated attribute, which is used to provide control over the attribute's value.

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.

The correct answer is  B. The getNumberofCrosswords() method should be decorated with @classmethod . In the given code snippet, the  getNumberofCrosswords  method is intended to be a class method that returns the value of the  numberofcrosswords  class variable. However, the method is not decorated with the  @classmethod  decorator and does not take a  cls  parameter representing the class itself. To make  getNumberofCrosswords  a proper class method, it should be decorated with  @classmethod  and take a  cls  parameter as its first argument.

B. The  getNumberofCrosswords()  method should be decorated with  @classmethod .

This is because the  getNumberofCrosswords()  method is intended to access the class-level variable  numberofcrosswords , but it is defined as an instance method, which requires an instance of the class to be created before it can be called. To make it work as a class-level method, you can define it as a class method by adding the  @classmethod  decorator to the function.

Here's an example of how to define  getNumberofCrosswords()  as a class method:

class Crossword :

numberofcrosswords = 0

def __init__(self, author, title):

self.author = author

self.title = title

Crossword.numberofcrosswords += 1

@classmethod

def getNumberofCrosswords (cls):

return cls.numberofcrosswords

In this example,  getNumberofCrosswords()  is defined as a class method using the  @classmethod  decorator, and the  cls  parameter is used to access the class-level variable  numberofcrosswords .

The correct answer is C. The logging format string requires the logger name first, followed immediately by the log level in square brackets, then the timestamp in square brackets, followed by a colon and the message. The default value produced by %(asctime)s includes milliseconds separated by a comma, such as 2019-10-19 18:21:35,407. Option C exactly matches that structure: root is the logger name, [CRITICAL] is the level name, [2019-10-19 18:21:35,407] is the timestamp, and Invalid argument is the message. Options B and D use colon separators instead of brackets, while option A omits the milliseconds required by the default asctime format.

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 dump() method in the xml.etree.ElementTree module allows you to output a debug representation of an XML tree to a file or standard output. This method is useful for analyzing the structure of the tree and tracking down errors.

A. The sqlite3 module in python provides an interface compliant to the DB-API 2.0. Thus, it follows a standard performance metric that allows for consistency in database programming with python.

B. The special name 'memory' is used to create a database in RAM using the sqlite3 module. Thus, when you use it as the name of the database file while opening a connection, it creates a temporary database that exists only in memory.