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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Programming | 18% | - HTTP & Client-Server Communication - TCP/IP & Socket Programming - JSON/XML Data Exchange - REST API Basics |
| Topic 2: File & Data Processing | 15% | - CSV & Configuration Files - XML & JSON Parsing - Logging & System Interaction - SQLite3 Database Operations |
| Topic 3: Advanced Object-Oriented Programming | 25% | - Metaclasses & Metaprogramming - Abstract Base Classes - Advanced Exceptions & Exception Chaining - Design Patterns - Attribute Access & Descriptors - Shallow vs Deep Copy & Serialization - Multiple Inheritance & Mixins |
| Topic 4: Modules, Packages & Advanced Features | 10% | - Functional Programming Tools - Import System & Namespaces - Decorators & Context Managers |
| Topic 5: GUI Programming | 20% | - Dialogs & Application Structure - Tkinter Basics & Widgets - Event-Driven Paradigm - Event Handling & Callbacks |
| Topic 6: Coding Conventions, Best Practices & Standardization | 12% | - Pythonic Principles - Code Readability & Documentation - PEP 1, PEP 8, PEP 20, PEP 257 |
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NEW QUESTION # 69
Analyze the following snippet and select the statement that best describes it.
Answer: C
Explanation:
Explanation
The provided code snippet defines a function f1 that accepts variable-length arguments using the *args and **kwargs syntax. The *args parameter allows for an arbitrary number of unnamed arguments to be passed to the function as a tuple, while the **kwargs parameter allows for an arbitrary number of named arguments to be passed to the function as a dictionary.
Therefore, the correct statement that best describes the code is:
The *args parameter holds a list of unnamed parameters, while the **kwargs parameter holds a dictionary of named parameters.
NEW QUESTION # 70
Look at the following code snippets and decide which ones follow PEP 8 recommendations for whitespacesin expressions and statements(Select two answers.)
Answer: A,B
Explanation:
Explanation
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.
NEW QUESTION # 71
Look at the following examples of comments and docstrings in Python Select the ones that are useful and compliant with PEP 8 recommendations (Select the two best answers.)
Answer: C,D
Explanation:
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 .
NEW QUESTION # 72
Select the true statements about the connection-oriented and connectionless types of communication. (Select two answers.)
Answer: B,D
Explanation:
A). In the context of TCP/IP networks, the communication side that initiates a connection is called the client, whereas the side that answers the client is called the server.
This statement is true because TCP/IP networks use a client-server model to establish connection-oriented communications. The client is the device or application that requests a service or resource from another device or application, which is called the server. The server responds to the client's request and provides the service or resource. For example, when you browse a website using a web browser, the browser acts as a client and sends a request to the web server that hosts the website. The web server acts as a server and sends back the requested web page to the browser 1 .
B). Connectionless communications are usually built on top of TCP.
This statement is false because TCP (Transmission Control Protocol) is a connection-oriented protocol that requires establishing and terminating a connection before and after sending data. Connectionless communications are usually built on top of UDP (User Datagram Protocol), which is a connectionless protocol that does not require any connection setup or teardown. UDP simply sends data packets to the destination without checking if they are received or not 2 .
C). Using walkie-talkies is an example of a connection-oriented communication.
This statement is false because using walkie-talkies is an example of a connectionless communication. Walkie- talkies do not establish a dedicated channel or connection between the sender and receiver before transmitting data. They simply broadcast data over a shared frequency without ensuring that the receiver is ready or available to receive it. The sender does not know if the receiver has received the data or not 3 .
D). A phone call is an example of a connection-oriented communication.
This statement is true because a phone call is an example of a connection-oriented communication. A phone call requires setting up a circuit or connection between the caller and callee before exchanging voice data. The caller and callee can hear each other's voice and know if they are connected or not. The phone call also requires terminating the connection when the conversation is over 4 .
References:
1 : https://www.techtarget.com/searchnetworking/definition/client-server 2 : https://www.javatpoint.com
/connection-oriented-vs-connectionless-service 3 : https://en.wikipedia.org/wiki/Walkie-talkie 4 : https://en.
wikipedia.org/wiki/Telephone_call
A is true because in the context of TCP/IP networks, the communication side that initiates a connection is called the client, and the side that answers the client is called the server. This is the basis for establishing a connection-oriented communication.
D is true because a phone call is an example of a connection-oriented communication. Like TCP/IP, a phone call establishes a connection between two devices (in this case, two phones) before communication can occur.
A is true because in the context of TCP/IP networks, the communication side that initiates a connection is called the client, and the side that answers the client is called the server. This is the basis for establishing a connection-oriented communication.
D is true because a phone call is an example of a connection-oriented communication. Like TCP/IP, a phone call establishes a connection between two devices (in this case, two phones) before communication can occur.
B is false because connectionless communications are usually built on top of UDP, not TCP. UDP is a connectionless protocol that does not establish a connection before sending data.
C is false because using walkie-talkies is an example of a connectionless communication. Walkie-talkies do not establish a connection before communication begins, and messages are simply broadcasted to all devices within range.
Here is a sample code in Python using the socket module to create a TCP server and client to demonstrate the connection-oriented communication:
Server-side code:
import socket
HOST = '127.0.0.1'
PORT = 8080
with socket. socket (socket.AF_INET, socket.SOCK_STREAM) as s:
s. bind ((HOST, PORT))
s. listen ()
conn, addr = s. accept ()
with conn:
print ( 'Connected by' , addr)
while True:
data = conn. recv ( 1024 )
if not data:
break
conn. sendall (data)
Client-side code:
import socket
HOST = '127.0.0.1'
PORT = 8080
with socket. socket (socket.AF_INET, socket.SOCK_STREAM) as s:
s. connect ((HOST, PORT))
s. sendall (b ' Hello, world ' )
data = s. recv ( 1024 )
print ( 'Received' , repr (data))
The server listens for incoming connections on port 8080, and when a connection is established, it prints the address of the client that has connected. The server then continuously receives data from the client and sends it back to the client until the connection is closed.
The client establishes a connection with the server and sends the message "Hello, world" encoded as bytes. It then waits for a response from the server and prints the data it receives.
NEW QUESTION # 73
What will be the content of the cars.xml file when you run the following code?
import xml.etree.ElementTree as ET
root = ET.Element('data')
car_1 = ET.SubElement(root, 'car', {'brand': 'Audi'})
car_2 = ET.SubElement(root, 'car', {'brand': 'Volkswagen'})
tree = ET.ElementTree(root)
tree.write('cars.xml', 'UTF-8', True)
Answer: C
Explanation:
The correct answer is C. The code creates an XML root element named data and then adds two child elements named car. Each car element receives a brand attribute, one with the value Audi and the other with the value Volkswagen. The statement tree.write('cars.xml', 'UTF-8', True) writes the XML document using UTF-8 encoding and explicitly enables the XML declaration through the third argument. Because the XML declaration is enabled, the output begins with < ?xml version='1.0' encoding='UTF-8'? > . The generated XML body then contains the data element with two self-closing car child elements. Options without the encoding declaration are therefore incomplete.
NEW QUESTION # 74
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