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| Section | Weight | Objectives |
|---|---|---|
| Advanced Object-Oriented Programming | 25% | - Abstract Base Classes - Metaclasses & Metaprogramming - Shallow vs Deep Copy & Serialization - Multiple Inheritance & Mixins - Advanced Exceptions & Exception Chaining - Design Patterns - Attribute Access & Descriptors |
| Modules, Packages & Advanced Features | 10% | - Functional Programming Tools - Import System & Namespaces - Decorators & Context Managers |
| Coding Conventions, Best Practices & Standardization | 12% | - Code Readability & Documentation - PEP 1, PEP 8, PEP 20, PEP 257 - Pythonic Principles |
| GUI Programming | 20% | - Event-Driven Paradigm - Dialogs & Application Structure - Event Handling & Callbacks - Tkinter Basics & Widgets |
| File & Data Processing | 15% | - CSV & Configuration Files - Logging & System Interaction - SQLite3 Database Operations - XML & JSON Parsing |
| Network Programming | 18% | - TCP/IP & Socket Programming - HTTP & Client-Server Communication - REST API Basics - JSON/XML Data Exchange |
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NEW QUESTION # 54
Select the true statements about the connection-oriented and connectionless types of communication. (Select two answers.)
Answer: A,D
Explanation:
Explanation
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 browser1.
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 not2.
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 not3.
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 over4.
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:
importsocket
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)
whileTrue:
data = conn.recv(1024)
ifnotdata:
break
conn.sendall(data)
Client-side code:
importsocket
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 # 55
Select the correct statements about the csv module.
(Select two answers.)
Answer: B,C
Explanation:
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.
NEW QUESTION # 56
Which of the following is not a widget property?
Answer: D
Explanation:
The correct answer is D. Tkinter widgets support many configuration options, and options such as width, underline, and highlightthickness are valid properties for relevant widgets. For example, width can define widget size, underline can specify which character should be underlined in text-based widgets, and highlightthickness controls the thickness of the focus highlight border. The option depth, however, is not a standard Tkinter widget configuration property. Tkinter widget options are specific names understood by the underlying Tk system, and unsupported names normally produce configuration errors when used. Therefore, among the listed options, depth is the one that does not belong as a Tkinter widget property.
NEW QUESTION # 57
A socket object is usually created by which one of the following invocations?
Answer: B
Explanation:
A socket object is usually created using the socket() constructor provided by the socket module in Python.
The correct invocation is socket.socket(socket_domain, socket_type) . This creates a new socket object with the specified socket domain and type.
Reference: Official Python documentation on socket programming: https://docs.python.org/3/library/socket.
html
NEW QUESTION # 58
A property of the event object called widget is in fact:
Answer: A
Explanation:
The correct answer is A. In Tkinter event handling, an event object contains information about the event that occurred. One of its useful attributes is widget, which refers to the actual widget object that caused or received the event. This is not merely the widget's name as text; it is a reference to the widget instance itself. That means the event handler can inspect or manipulate the widget directly, for example by reading its configuration or changing its displayed value. Option B and option D are incorrect because they describe a name, not an object reference. Option C is unrelated, since run() is not part of Tkinter event object semantics.
NEW QUESTION # 59
......
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